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: I9029cc722e7712633c15436bd3868d8c3209f567
diff --git a/json_config.hpp b/json_config.hpp
index aae33b9..5102ca9 100644
--- a/json_config.hpp
+++ b/json_config.hpp
@@ -174,7 +174,7 @@
      * attempting to get a configuration file. Once the list of compatible
      * values has been updated, it calls the load function.
      */
-    void compatIntfAdded(sdbusplus::message::message& msg)
+    void compatIntfAdded(sdbusplus::message_t& msg)
     {
         sdbusplus::message::object_path op;
         std::map<std::string,