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: I9cedddf4dc9b224ecbc2f68e6b00c0ab1885a826
diff --git a/manager.hpp b/manager.hpp
index 8ccea4a..03229fb 100644
--- a/manager.hpp
+++ b/manager.hpp
@@ -27,7 +27,7 @@
   public:
     friend class TestManager;
 
-    explicit Manager(sdbusplus::bus::bus& bus);
+    explicit Manager(sdbusplus::bus_t& bus);
     Manager(const Manager&) = delete;
     Manager& operator=(const Manager&) = delete;
     Manager(Manager&&) = delete;
@@ -36,10 +36,10 @@
 
   private:
     /** @brief Persistent sdbusplus DBus connection */
-    sdbusplus::bus::bus& bus;
+    sdbusplus::bus_t& bus;
 
     /** @brief The match of settings property change */
-    std::vector<sdbusplus::bus::match::match> settingsMatches;
+    std::vector<sdbusplus::bus::match_t> settingsMatches;
 
     /** @brief Settings objects of intereset */
     settings::Objects settings;
@@ -81,7 +81,7 @@
      *
      *  @return 0 on success, < 0 on failure.
      */
-    int onSettingsChanged(sdbusplus::message::message& msg);
+    int onSettingsChanged(sdbusplus::message_t& msg);
 
     /** @brief Notified on settings property changed
      *