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: I9029cc722e7712633c15436bd3868d8c3209f567
diff --git a/monitor/system.cpp b/monitor/system.cpp
index 9da828b..77f3fab 100644
--- a/monitor/system.cpp
+++ b/monitor/system.cpp
@@ -33,6 +33,7 @@
 #include <nlohmann/json.hpp>
 #include <phosphor-logging/log.hpp>
 #include <sdbusplus/bus.hpp>
+#include <sdbusplus/bus/match.hpp>
 #include <sdeventplus/event.hpp>
 #include <sdeventplus/source/signal.hpp>
 
@@ -44,7 +45,7 @@
 
 using namespace phosphor::logging;
 
-System::System(Mode mode, sdbusplus::bus::bus& bus,
+System::System(Mode mode, sdbusplus::bus_t& bus,
                const sdeventplus::Event& event) :
     _mode(mode),
     _bus(bus), _event(event),
@@ -59,7 +60,7 @@
     namespace match = sdbusplus::bus::match;
 
     // must be done before service detection
-    _inventoryMatch = std::make_unique<match::match>(
+    _inventoryMatch = std::make_unique<sdbusplus::bus::match_t>(
         _bus, match::rules::nameOwnerChanged(util::INVENTORY_SVC),
         std::bind(&System::inventoryOnlineCb, this, std::placeholders::_1));
 
@@ -177,7 +178,7 @@
         for (const auto& [serviceName, unused] : sensorMap)
         {
             // map its service name to the sensor
-            _sensorMatch.emplace_back(std::make_unique<match::match>(
+            _sensorMatch.emplace_back(std::make_unique<sdbusplus::bus::match_t>(
                 _bus, match::rules::nameOwnerChanged(serviceName),
                 std::bind(&System::tachSignalOffline, this,
                           std::placeholders::_1, sensorMap)));
@@ -190,7 +191,7 @@
     }
 }
 
-void System::inventoryOnlineCb(sdbusplus::message::message& msg)
+void System::inventoryOnlineCb(sdbusplus::message_t& msg)
 {
     namespace match = sdbusplus::bus::match;
 
@@ -283,7 +284,7 @@
 // Determine on/offline status, set all sensors for that service
 // to new state
 //
-void System::tachSignalOffline(sdbusplus::message::message& msg,
+void System::tachSignalOffline(sdbusplus::message_t& msg,
                                SensorMapType const& sensorMap)
 {
     std::string serviceName, oldOwner, newOwner;