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: Ibd2a0b512bfb7caf65bfab64b271d194da520aac
diff --git a/systemintfcmds.cpp b/systemintfcmds.cpp
index 7596ab9..23e80a2 100644
--- a/systemintfcmds.cpp
+++ b/systemintfcmds.cpp
@@ -129,7 +129,7 @@
 // Static storage to keep the object alive during process life
 std::unique_ptr<phosphor::host::command::Host> host
     __attribute__((init_priority(101)));
-std::unique_ptr<sdbusplus::server::manager::manager> objManager
+std::unique_ptr<sdbusplus::server::manager_t> objManager
     __attribute__((init_priority(101)));
 } // namespace
 
@@ -162,7 +162,7 @@
         ipmid_get_sdbus_plus_handler();
 
     // Add sdbusplus ObjectManager.
-    objManager = std::make_unique<sdbusplus::server::manager::manager>(
+    objManager = std::make_unique<sdbusplus::server::manager_t>(
         *sdbusp, CONTROL_HOST_OBJ_MGR);
 
     host = std::make_unique<phosphor::host::command::Host>(*sdbusp,