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/epoch_base.hpp b/epoch_base.hpp
index 89a7b85..ed761f8 100644
--- a/epoch_base.hpp
+++ b/epoch_base.hpp
@@ -20,21 +20,21 @@
  *  DBus API for epoch time.
  */
 class EpochBase :
-    public sdbusplus::server::object::object<
+    public sdbusplus::server::object_t<
         sdbusplus::xyz::openbmc_project::Time::server::EpochTime>,
     public PropertyChangeListner
 {
   public:
     friend class TestEpochBase;
 
-    EpochBase(sdbusplus::bus::bus& bus, const char* objPath);
+    EpochBase(sdbusplus::bus_t& bus, const char* objPath);
 
     /** @brief Notified on time mode changed */
     void onModeChanged(Mode mode) override;
 
   protected:
     /** @brief Persistent sdbusplus DBus connection */
-    sdbusplus::bus::bus& bus;
+    sdbusplus::bus_t& bus;
 
     /** @brief The current time mode */
     Mode timeMode = DEFAULT_TIME_MODE;