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: Ief1b330c4f623ecc1be771f36083780a12260834
diff --git a/test/test_rtnetlink.cpp b/test/test_rtnetlink.cpp
index 51e7649..98d8db3 100644
--- a/test/test_rtnetlink.cpp
+++ b/test/test_rtnetlink.cpp
@@ -19,7 +19,7 @@
 
 namespace network
 {
-sdbusplus::bus::bus bus(sdbusplus::bus::new_default());
+sdbusplus::bus_t bus(sdbusplus::bus::new_default());
 extern std::unique_ptr<MockManager> manager;
 extern std::unique_ptr<Timer> refreshObjectTimer;
 EventPtr eventPtr = nullptr;