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: Ic63a70d32f4683e0bd92b625cc36c836aa8395a8
diff --git a/manager.hpp b/manager.hpp
index 744caa5..e580481 100644
--- a/manager.hpp
+++ b/manager.hpp
@@ -60,7 +60,7 @@
      *  @param[in] root - The DBus path on which to implement
      *      an inventory manager.
      */
-    Manager(sdbusplus::bus::bus&&, const char*);
+    Manager(sdbusplus::bus_t&&, const char*);
 
     using EventInfo =
         std::tuple<std::vector<EventBasePtr>, std::vector<Action>>;
@@ -79,7 +79,7 @@
         notify(std::map<sdbusplus::message::object_path, Object> objs) override;
 
     /** @brief Event processing entry point. */
-    void handleEvent(sdbusplus::message::message&, const Event& event,
+    void handleEvent(sdbusplus::message_t&, const Event& event,
                      const EventInfo& info);
 
     /** @brief Drop one or more objects from DBus. */
@@ -201,10 +201,10 @@
     std::vector<sdbusplus::bus::match_t> _matches;
 
     /** @brief Persistent sdbusplus DBus bus connection. */
-    sdbusplus::bus::bus _bus;
+    sdbusplus::bus_t _bus;
 
     /** @brief sdbusplus org.freedesktop.DBus.ObjectManager reference. */
-    sdbusplus::server::manager::manager _manager;
+    sdbusplus::server::manager_t _manager;
 
     /** @brief A container of pimgen generated events and responses.  */
     static const Events _events;