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: I96286490697ce5d7fecc1c9c358f5f1d054137ec
diff --git a/item_updater.cpp b/item_updater.cpp
index c8fda76..96782f2 100644
--- a/item_updater.cpp
+++ b/item_updater.cpp
@@ -38,7 +38,7 @@
 namespace fs = std::filesystem;
 using NotAllowed = sdbusplus::xyz::openbmc_project::Common::Error::NotAllowed;
 
-void ItemUpdater::createActivation(sdbusplus::message::message& msg)
+void ItemUpdater::createActivation(sdbusplus::message_t& msg)
 {
 
     using SVersion = server::Version;
@@ -636,7 +636,7 @@
             bmcInventoryPath = result.front();
         }
     }
-    catch (const sdbusplus::exception::exception& e)
+    catch (const sdbusplus::exception_t& e)
     {
         error("Error in mapper GetSubTreePath: {ERROR}", "ERROR", e);
         return;