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: Ic68a12ef7c12222b1300981282161c971b561dc1
diff --git a/command/session_cmds.cpp b/command/session_cmds.cpp
index 25e906e..8a4014a 100644
--- a/command/session_cmds.cpp
+++ b/command/session_cmds.cpp
@@ -168,7 +168,7 @@
             }
         }
     }
-    catch (const sdbusplus::exception::exception& e)
+    catch (const sdbusplus::exception_t& e)
     {
         log<level::ERR>("Failed to fetch object from dbus",
                         entry("INTERFACE=%s", session::sessionIntf),
@@ -298,7 +298,7 @@
             session::Manager::get().getSession(handler->sessionID);
         currentSessionPriv = currentSession->currentPrivilege();
     }
-    catch (const sdbusplus::exception::exception& e)
+    catch (const sdbusplus::exception_t& e)
     {
         log<level::ERR>("Failed to fetch object from dbus",
                         entry("INTERFACE=%s", session::sessionIntf),