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: If9a7314dade153dd7dbd149a76352aca8257839d
diff --git a/msl_verify.cpp b/msl_verify.cpp
index e59e250..1be1d04 100644
--- a/msl_verify.cpp
+++ b/msl_verify.cpp
@@ -93,7 +93,7 @@
     {
         response.read(associations);
     }
-    catch (const sdbusplus::exception::exception& e)
+    catch (const sdbusplus::exception_t& e)
     {
         log<level::ERR>("Failed to read software associations",
                         entry("ERROR=%s", e.what()),
@@ -123,7 +123,7 @@
                 response.read(functionalVersion);
                 return std::get<std::string>(functionalVersion);
             }
-            catch (const sdbusplus::exception::exception& e)
+            catch (const sdbusplus::exception_t& e)
             {
                 log<level::ERR>(
                     "Failed to read version property",