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: Ie530f2c63000bbfac7c5fbbc74ebe6bc8c07fb1a
diff --git a/test/test_item_updater.cpp b/test/test_item_updater.cpp
index dab6a57..2fe1c86 100644
--- a/test/test_item_updater.cpp
+++ b/test/test_item_updater.cpp
@@ -59,7 +59,7 @@
 
     static constexpr auto dBusPath = SOFTWARE_OBJPATH;
     sdbusplus::SdBusMock sdbusMock;
-    sdbusplus::bus::bus mockedBus = sdbusplus::get_mocked_new(&sdbusMock);
+    sdbusplus::bus_t mockedBus = sdbusplus::get_mocked_new(&sdbusMock);
     const utils::MockedUtils& mockedUtils;
     std::unique_ptr<ItemUpdater> itemUpdater;
     Properties propAdded{{PRESENT, PropertyType(true)}};