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/ibm/hypervisor-network-mgr-test/mock_hyp_sys_config.hpp b/test/ibm/hypervisor-network-mgr-test/mock_hyp_sys_config.hpp
index e5bd42d..1f5b6e6 100644
--- a/test/ibm/hypervisor-network-mgr-test/mock_hyp_sys_config.hpp
+++ b/test/ibm/hypervisor-network-mgr-test/mock_hyp_sys_config.hpp
@@ -14,7 +14,7 @@
 class MockHypSysConfig : public phosphor::network::HypSysConfig
 {
   public:
-    MockHypSysConfig(sdbusplus::bus::bus& bus, const std::string& objPath,
+    MockHypSysConfig(sdbusplus::bus_t& bus, const std::string& objPath,
                      HypNetworkMgr& parent) :
         HypSysConfig(bus, objPath, parent)
     {