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/presence/error_reporter.cpp b/presence/error_reporter.cpp
index 72c7dae..6210f7d 100644
--- a/presence/error_reporter.cpp
+++ b/presence/error_reporter.cpp
@@ -43,7 +43,7 @@
 const auto loggingCreateIface = "xyz.openbmc_project.Logging.Create";
 
 ErrorReporter::ErrorReporter(
-    sdbusplus::bus::bus& bus,
+    sdbusplus::bus_t& bus,
     const std::vector<
         std::tuple<Fan, std::vector<std::unique_ptr<PresenceSensor>>>>& fans) :
     _bus(bus),
@@ -93,7 +93,7 @@
     }
 }
 
-void ErrorReporter::presenceChanged(sdbusplus::message::message& msg)
+void ErrorReporter::presenceChanged(sdbusplus::message_t& msg)
 {
     bool present;
     auto fanPath = msg.get_path();