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: I96286490697ce5d7fecc1c9c358f5f1d054137ec
diff --git a/download_manager.hpp b/download_manager.hpp
index 9f7d1cf..a947747 100644
--- a/download_manager.hpp
+++ b/download_manager.hpp
@@ -13,7 +13,7 @@
 namespace manager
 {
 
-using DownloadInherit = sdbusplus::server::object::object<
+using DownloadInherit = sdbusplus::server::object_t<
     sdbusplus::xyz::openbmc_project::Common::server::TFTP>;
 
 /** @class Download
@@ -29,7 +29,7 @@
      * @param[in] bus       - The Dbus bus object
      * @param[in] objPath   - The Dbus object path
      */
-    Download(sdbusplus::bus::bus& bus, const std::string& objPath) :
+    Download(sdbusplus::bus_t& bus, const std::string& objPath) :
         DownloadInherit(bus, (objPath).c_str()){};
 
     /**