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: Ie530f2c63000bbfac7c5fbbc74ebe6bc8c07fb1a
diff --git a/src/activation.cpp b/src/activation.cpp
index 8ea4f25..9112c3f 100644
--- a/src/activation.cpp
+++ b/src/activation.cpp
@@ -60,7 +60,7 @@
     return SoftwareActivation::requestedActivation(value);
 }
 
-void Activation::unitStateChange(sdbusplus::message::message& msg)
+void Activation::unitStateChange(sdbusplus::message_t& msg)
 {
     uint32_t newStateID{};
     sdbusplus::message::object_path newStateObjPath;
@@ -95,7 +95,7 @@
         bus.call_noreply(method);
         return true;
     }
-    catch (const sdbusplus::exception::exception& e)
+    catch (const sdbusplus::exception_t& e)
     {
         log<level::ERR>("Error staring service", entry("ERROR=%s", e.what()));
         onUpdateFailed();
@@ -264,7 +264,7 @@
     {
         bus.call(method);
     }
-    catch (const sdbusplus::exception::exception& e)
+    catch (const sdbusplus::exception_t& e)
     {
         log<level::ERR>("Error performing call to Delete object path",
                         entry("ERROR=%s", e.what()),