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

Change-Id: Ie0805a98908ddca5c97471588adc160d9f5633c6
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/test/test_health_metric.cpp b/test/test_health_metric.cpp
index 9e9f1f5..1fd0b15 100644
--- a/test/test_health_metric.cpp
+++ b/test/test_health_metric.cpp
@@ -24,7 +24,7 @@
 {
   public:
     sdbusplus::SdBusMock sdbusMock;
-    sdbusplus::bus::bus bus = sdbusplus::get_mocked_new(&sdbusMock);
+    sdbusplus::bus_t bus = sdbusplus::get_mocked_new(&sdbusMock);
     static constexpr auto busName = "xyz.openbmc_project.test.HealthMon";
     const std::set<std::string> properties = {"Value", "MaxValue", "MinValue",
                                               "Unit"};
@@ -49,7 +49,7 @@
 
 TEST_F(HealthMetricTest, TestMetricUnmockedObjectAddRemove)
 {
-    sdbusplus::bus::bus unmockedBus = sdbusplus::bus::new_bus();
+    sdbusplus::bus_t unmockedBus = sdbusplus::bus::new_bus();
     unmockedBus.request_name(busName);
     auto metric = std::make_unique<HealthMetric>(unmockedBus, Type::cpu, config,
                                                  paths_t());