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: Ibc25db433a6926f7ee43ea83312c3ac14f480c33
diff --git a/extensions/openpower-pels/src.cpp b/extensions/openpower-pels/src.cpp
index f0f530e..1a5acf7 100644
--- a/extensions/openpower-pels/src.cpp
+++ b/extensions/openpower-pels/src.cpp
@@ -887,7 +887,7 @@
             callout =
                 std::make_unique<src::Callout>(p, locCode, fn, ccin, sn, mrus);
         }
-        catch (const sdbusplus::exception::exception& e)
+        catch (const sdbusplus::exception_t& e)
         {
             std::string msg =
                 "No VPD found for " + inventoryPath + ": " + e.what();
@@ -898,7 +898,7 @@
                 CalloutPriority::high, locCode, fn, ccin, sn, mrus);
         }
     }
-    catch (const sdbusplus::exception::exception& e)
+    catch (const sdbusplus::exception_t& e)
     {
         std::string msg = "Could not get location code for " + inventoryPath +
                           ": " + e.what();