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: I0eb22958103519924e336a2260a4d48015848c3e
diff --git a/ibm_vpd_utils.cpp b/ibm_vpd_utils.cpp
index 11d0faf..b1d909d 100644
--- a/ibm_vpd_utils.cpp
+++ b/ibm_vpd_utils.cpp
@@ -70,7 +70,7 @@
 
         response.read(result);
     }
-    catch (const sdbusplus::exception::exception& e)
+    catch (const sdbusplus::exception_t& e)
     {
         log<level::ERR>("Error in mapper GetSubTree",
                         entry("ERROR=%s", e.what()));
@@ -180,7 +180,7 @@
         method.append(errIntf, pelSeverity, additionalData);
         auto resp = bus.call(method);
     }
-    catch (const sdbusplus::exception::exception& e)
+    catch (const sdbusplus::exception_t& e)
     {
         throw std::runtime_error(
             "Error in invoking D-Bus logging create interface to register PEL");