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

Change-Id: Iaf9bb4a5ea6a04cf1c65fc0f32b1cca833ccdb71
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/vpd-manager/manager.cpp b/vpd-manager/manager.cpp
index 35d9ddf..cf20b0a 100644
--- a/vpd-manager/manager.cpp
+++ b/vpd-manager/manager.cpp
@@ -203,7 +203,7 @@
     }
 }
 
-void Manager::hostStateCallBack(sdbusplus::message::message& msg)
+void Manager::hostStateCallBack(sdbusplus::message_t& msg)
 {
     if (msg.is_method_error())
     {