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: I7ae6214461bdf45c1a21fb702cc8bf5578d827c6
diff --git a/core_manager.cpp b/core_manager.cpp
index dc3e869..e764953 100644
--- a/core_manager.cpp
+++ b/core_manager.cpp
@@ -70,7 +70,7 @@
         auto mapperResponseMsg = b.call(mapper);
         mapperResponseMsg.read(mapperResponse);
     }
-    catch (const sdbusplus::exception::exception& e)
+    catch (const sdbusplus::exception_t& e)
     {
         log<level::ERR>(
             fmt::format("Failed to GetObject on Dump.Internal: {}", e.what())
@@ -91,7 +91,7 @@
     {
         b.call_noreply(m);
     }
-    catch (const sdbusplus::exception::exception& e)
+    catch (const sdbusplus::exception_t& e)
     {
         log<level::ERR>(
             fmt::format("Failed to create dump: {}", e.what()).c_str());