entity-manager: not pass through io, objServer

Pass
`boost::asio::io_context& io`
and
`sdbusplus::asio::object_server& objServer`

into constructor for class EMDBusInterface.

Since these are just references, nothing exciting should happen here.
The change reduces the number of parameters and makes the code more
easily readable.

Tested: on Tyan S8030

clean log
```
Sep 22 16:00:47 s8030-bmc-30303035c0c1 systemd[1]: Started Entity Manager.
Sep 22 16:00:57 s8030-bmc-30303035c0c1 entity-manager[10392]: Inventory Added: Supermicro PWS 920P SQ 0
Sep 22 16:00:57 s8030-bmc-30303035c0c1 entity-manager[10392]: Inventory Added: Supermicro PWS 920P SQ 1
Sep 22 16:00:57 s8030-bmc-30303035c0c1 entity-manager[10392]: Inventory Added: Tyan S8030 Baseboard
Sep 22 16:00:57 s8030-bmc-30303035c0c1 entity-manager[10392]: Inventory Added: MBX 1.57 Chassis
```

and clean `busctl tree`
```
busctl tree xyz.openbmc_project.EntityManager
`- /xyz
  `- /xyz/openbmc_project
    |- /xyz/openbmc_project/EntityManager
    `- /xyz/openbmc_project/inventory
      `- /xyz/openbmc_project/inventory/system
        |- /xyz/openbmc_project/inventory/system/board
        | `- /xyz/openbmc_project/inventory/system/board/Tyan_S8030_Baseboard
        |   |- /xyz/openbmc_project/inventory/system/board/Tyan_S8030_Baseboard/CPU0_Power_Consumption
        |   |- /xyz/openbmc_project/inventory/system/board/Tyan_S8030_Baseboard/CPU0_Temp
        |   |- /xyz/openbmc_project/inventory/system/board/Tyan_S8030_Baseboard/GARBO_SENSOR
        |   |- /xyz/openbmc_project/inventory/system/board/Tyan_S8030_Baseboard/HostSPIFlash
        |   |- /xyz/openbmc_project/inventory/system/board/Tyan_S8030_Baseboard/P0_VDD_18_RUN
        |   |- /xyz/openbmc_project/inventory/system/board/Tyan_S8030_Baseboard/P0_VDD_CORE_RUN
        |   |- /xyz/openbmc_project/inventory/system/board/Tyan_S8030_Baseboard/P0_VDD_MEM_ABCD
        |   |- /xyz/openbmc_project/inventory/system/board/Tyan_S8030_Baseboard/P0_VDD_MEM_EFGH
        |   |- /xyz/openbmc_project/inventory/system/board/Tyan_S8030_Baseboard/P0_VDD_SOC_RUN
        |   |- /xyz/openbmc_project/inventory/system/board/Tyan_S8030_Baseboard/VBAT_33
        |   |- /xyz/openbmc_project/inventory/system/board/Tyan_S8030_Baseboard/VDD_12_RUN
        |   |- /xyz/openbmc_project/inventory/system/board/Tyan_S8030_Baseboard/VDD_33_DUAL
        |   |- /xyz/openbmc_project/inventory/system/board/Tyan_S8030_Baseboard/VDD_33_RUN
        |   |- /xyz/openbmc_project/inventory/system/board/Tyan_S8030_Baseboard/VDD_5_DUAL
        |   |- /xyz/openbmc_project/inventory/system/board/Tyan_S8030_Baseboard/VDD_5_RUN
        |   `- /xyz/openbmc_project/inventory/system/board/Tyan_S8030_Baseboard/X550
        |- /xyz/openbmc_project/inventory/system/chassis
        | `- /xyz/openbmc_project/inventory/system/chassis/MBX_1_57_Chassis
        |   |- /xyz/openbmc_project/inventory/system/chassis/MBX_1_57_Chassis/Fan_Control
        |   |- /xyz/openbmc_project/inventory/system/chassis/MBX_1_57_Chassis/GenericContainPort
        |   |- /xyz/openbmc_project/inventory/system/chassis/MBX_1_57_Chassis/NIC_1_Ignore
        |   |- /xyz/openbmc_project/inventory/system/chassis/MBX_1_57_Chassis/NIC_2_Ignore
        |   |- /xyz/openbmc_project/inventory/system/chassis/MBX_1_57_Chassis/NIC_FRU_1
        |   |- /xyz/openbmc_project/inventory/system/chassis/MBX_1_57_Chassis/NIC_FRU_2
        |   |- /xyz/openbmc_project/inventory/system/chassis/MBX_1_57_Chassis/SYS_FAN_1
        |   |- /xyz/openbmc_project/inventory/system/chassis/MBX_1_57_Chassis/SYS_FAN_2
        |   |- /xyz/openbmc_project/inventory/system/chassis/MBX_1_57_Chassis/SYS_FAN_3
        |   |- /xyz/openbmc_project/inventory/system/chassis/MBX_1_57_Chassis/Temperature_Control
        |   `- /xyz/openbmc_project/inventory/system/chassis/MBX_1_57_Chassis/Zone0
        `- /xyz/openbmc_project/inventory/system/powersupply
          |- /xyz/openbmc_project/inventory/system/powersupply/Supermicro_PWS_920P_SQ_0
          | |- /xyz/openbmc_project/inventory/system/powersupply/Supermicro_PWS_920P_SQ_0/PSU0
          | |- /xyz/openbmc_project/inventory/system/powersupply/Supermicro_PWS_920P_SQ_0/PSU0_ADDR
          | `- /xyz/openbmc_project/inventory/system/powersupply/Supermicro_PWS_920P_SQ_0/PSU0_FRU
          `- /xyz/openbmc_project/inventory/system/powersupply/Supermicro_PWS_920P_SQ_1
            |- /xyz/openbmc_project/inventory/system/powersupply/Supermicro_PWS_920P_SQ_1/PSU1
            |- /xyz/openbmc_project/inventory/system/powersupply/Supermicro_PWS_920P_SQ_1/PSU1_ADDR
            `- /xyz/openbmc_project/inventory/system/powersupply/Supermicro_PWS_920P_SQ_1/PSU1_FRU
```

Change-Id: Id292bf86a72c9b6e707b2cec71b77c63ed5077a2
Signed-off-by: Alexander Hansen <alexander.hansen@9elements.com>
diff --git a/src/entity_manager/dbus_interface.cpp b/src/entity_manager/dbus_interface.cpp
index 3ae698c..b6fbc01 100644
--- a/src/entity_manager/dbus_interface.cpp
+++ b/src/entity_manager/dbus_interface.cpp
@@ -22,6 +22,11 @@
 const std::regex illegalDbusPathRegex("[^A-Za-z0-9_.]");
 const std::regex illegalDbusMemberRegex("[^A-Za-z0-9_]");
 
+EMDBusInterface::EMDBusInterface(boost::asio::io_context& io,
+                                 sdbusplus::asio::object_server& objServer) :
+    io(io), objServer(objServer)
+{}
+
 void tryIfaceInitialize(std::shared_ptr<sdbusplus::asio::dbus_interface>& iface)
 {
     try
@@ -38,9 +43,9 @@
 }
 
 std::shared_ptr<sdbusplus::asio::dbus_interface>
-    EMDBusInterface::createInterface(
-        sdbusplus::asio::object_server& objServer, const std::string& path,
-        const std::string& interface, const std::string& parent, bool checkNull)
+    EMDBusInterface::createInterface(const std::string& path,
+                                     const std::string& interface,
+                                     const std::string& parent, bool checkNull)
 {
     // on first add we have no reason to check for null before add, as there
     // won't be any. For dynamically added interfaces, we check for null so that
@@ -62,16 +67,15 @@
     return ptr;
 }
 
-void createDeleteObjectMethod(
+void EMDBusInterface::createDeleteObjectMethod(
     const std::string& jsonPointerPath,
     const std::shared_ptr<sdbusplus::asio::dbus_interface>& iface,
-    sdbusplus::asio::object_server& objServer,
-    nlohmann::json& systemConfiguration, boost::asio::io_context& io)
+    nlohmann::json& systemConfiguration)
 {
     std::weak_ptr<sdbusplus::asio::dbus_interface> interface = iface;
     iface->register_method(
-        "Delete", [&objServer, &systemConfiguration, interface,
-                   jsonPointerPath{std::string(jsonPointerPath)}, &io]() {
+        "Delete", [this, &systemConfiguration, interface,
+                   jsonPointerPath{std::string(jsonPointerPath)}]() {
             std::shared_ptr<sdbusplus::asio::dbus_interface> dbusInterface =
                 interface.lock();
             if (!dbusInterface)
@@ -85,7 +89,7 @@
 
             // todo(james): dig through sdbusplus to find out why we can't
             // delete it in a method call
-            boost::asio::post(io, [&objServer, dbusInterface]() mutable {
+            boost::asio::post(io, [dbusInterface, this]() mutable {
                 objServer.remove_interface(dbusInterface);
             });
 
@@ -196,12 +200,10 @@
 }
 
 // adds simple json types to interface's properties
-void populateInterfaceFromJson(
-    boost::asio::io_context& io, nlohmann::json& systemConfiguration,
-    const std::string& jsonPointerPath,
+void EMDBusInterface::populateInterfaceFromJson(
+    nlohmann::json& systemConfiguration, const std::string& jsonPointerPath,
     std::shared_ptr<sdbusplus::asio::dbus_interface>& iface,
-    nlohmann::json& dict, sdbusplus::asio::object_server& objServer,
-    sdbusplus::asio::PropertyPermission permission)
+    nlohmann::json& dict, sdbusplus::asio::PropertyPermission permission)
 {
     for (const auto& [key, value] : dict.items())
     {
@@ -232,25 +234,22 @@
     }
     if (permission == sdbusplus::asio::PropertyPermission::readWrite)
     {
-        createDeleteObjectMethod(jsonPointerPath, iface, objServer,
-                                 systemConfiguration, io);
+        createDeleteObjectMethod(jsonPointerPath, iface, systemConfiguration);
     }
     tryIfaceInitialize(iface);
 }
 
 void EMDBusInterface::createAddObjectMethod(
-    boost::asio::io_context& io, const std::string& jsonPointerPath,
-    const std::string& path, nlohmann::json& systemConfiguration,
-    sdbusplus::asio::object_server& objServer, const std::string& board)
+    const std::string& jsonPointerPath, const std::string& path,
+    nlohmann::json& systemConfiguration, const std::string& board)
 {
-    std::shared_ptr<sdbusplus::asio::dbus_interface> iface = createInterface(
-        objServer, path, "xyz.openbmc_project.AddObject", board);
+    std::shared_ptr<sdbusplus::asio::dbus_interface> iface =
+        createInterface(path, "xyz.openbmc_project.AddObject", board);
 
     iface->register_method(
         "AddObject",
-        [&systemConfiguration, &objServer,
-         jsonPointerPath{std::string(jsonPointerPath)}, path{std::string(path)},
-         board, &io,
+        [&systemConfiguration, jsonPointerPath{std::string(jsonPointerPath)},
+         path{std::string(path)}, board,
          this](const boost::container::flat_map<std::string, JsonVariantType>&
                    data) {
             nlohmann::json::json_pointer ptr(jsonPointerPath);
@@ -351,15 +350,15 @@
                                dbusName.end(), illegalDbusMemberRegex, "_");
 
             std::shared_ptr<sdbusplus::asio::dbus_interface> interface =
-                createInterface(objServer, path + "/" + dbusName,
+                createInterface(path + "/" + dbusName,
                                 "xyz.openbmc_project.Configuration." + *type,
                                 board, true);
             // permission is read-write, as since we just created it, must be
             // runtime modifiable
             populateInterfaceFromJson(
-                io, systemConfiguration,
+                systemConfiguration,
                 jsonPointerPath + "/Exposes/" + std::to_string(lastIndex),
-                interface, newData, objServer,
+                interface, newData,
                 sdbusplus::asio::PropertyPermission::readWrite);
         });
     tryIfaceInitialize(iface);