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: Ibd2a0b512bfb7caf65bfab64b271d194da520aac
diff --git a/host-interface.hpp b/host-interface.hpp
index 056ffe9..534f577 100644
--- a/host-interface.hpp
+++ b/host-interface.hpp
@@ -17,7 +17,7 @@
  *  and xyz.openbmc_project.Condition.HostFirmware DBus API's.
  */
 class Host
-    : public sdbusplus::server::object::object<
+    : public sdbusplus::server::object_t<
           sdbusplus::xyz::openbmc_project::Control::server::Host,
           sdbusplus::xyz::openbmc_project::Condition::server::HostFirmware>
 {
@@ -27,8 +27,8 @@
      *  @param[in] bus     - The Dbus bus object
      *  @param[in] objPath - The Dbus object path
      */
-    Host(sdbusplus::bus::bus& bus, const char* objPath) :
-        sdbusplus::server::object::object<
+    Host(sdbusplus::bus_t& bus, const char* objPath) :
+        sdbusplus::server::object_t<
             sdbusplus::xyz::openbmc_project::Control::server::Host,
             sdbusplus::xyz::openbmc_project::Condition::server::HostFirmware>(
             bus, objPath),
@@ -50,7 +50,7 @@
 
   private:
     /** @brief sdbusplus DBus bus connection. */
-    sdbusplus::bus::bus& bus;
+    sdbusplus::bus_t& bus;
 
     /** @brief  Callback function to be invoked by command manager
      *