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_ethernet_interface.cpp b/test/test_ethernet_interface.cpp
index 0846f7e..24fe5fb 100644
--- a/test/test_ethernet_interface.cpp
+++ b/test/test_ethernet_interface.cpp
@@ -25,7 +25,7 @@
 class TestEthernetInterface : public stdplus::gtest::TestWithTmp
 {
   public:
-    sdbusplus::bus::bus bus;
+    sdbusplus::bus_t bus;
     std::string confDir;
     MockManager manager;
     MockEthernetInterface interface;
@@ -39,7 +39,7 @@
 
     static constexpr ether_addr mac{0x11, 0x22, 0x33, 0x44, 0x55, 0x66};
 
-    static MockEthernetInterface makeInterface(sdbusplus::bus::bus& bus,
+    static MockEthernetInterface makeInterface(sdbusplus::bus_t& bus,
                                                MockManager& manager)
     {
         mock_clear();