sdbusplus: use shorter type aliases

The sdbusplus headers provide shortened aliases for many types.
Switch to using them to provide better code clarity and shorter
lines.  Possible replacements are for:
  * bus_t
  * exception_t
  * manager_t
  * match_t
  * message_t
  * object_t
  * slot_t

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I768b8efcac262ef07cf75f06486c6144c090e91a
diff --git a/manager.hpp b/manager.hpp
index eff9e10..b9a2039 100644
--- a/manager.hpp
+++ b/manager.hpp
@@ -43,7 +43,7 @@
      *
      * @param[in] bus - the D-Bus bus object
      */
-    explicit Manager(sdbusplus::bus::bus& bus);
+    explicit Manager(sdbusplus::bus_t& bus);
 
   private:
     using EntryID = uint32_t;
@@ -70,7 +70,7 @@
      *
      * @param[in] msg - the sdbusplus message
      */
-    void interfaceAdded(sdbusplus::message::message& msg);
+    void interfaceAdded(sdbusplus::message_t& msg);
 
     /**
      * The callback for an interfaces removed signal
@@ -80,7 +80,7 @@
      *
      * @param[in] msg - the sdbusplus message
      */
-    void interfaceRemoved(sdbusplus::message::message& msg);
+    void interfaceRemoved(sdbusplus::message_t& msg);
 
     /**
      * Creates the IBM interfaces for all existing error log
@@ -252,7 +252,7 @@
     /**
      * The sdbusplus bus object
      */
-    sdbusplus::bus::bus& bus;
+    sdbusplus::bus_t& bus;
 
     /**
      * The match object for interfacesAdded