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: I8c73d8de128b218ee4885a5e133314ad5d9a0ff8
diff --git a/dbusSensor.hpp b/dbusSensor.hpp
index bfda9b0..5c119a5 100644
--- a/dbusSensor.hpp
+++ b/dbusSensor.hpp
@@ -18,7 +18,7 @@
      * @param[in] bus     - Handle to system dbus
      * @param[in] path    - The Dbus path of sensor
      */
-    DbusSensor(sdbusplus::bus::bus& bus, const std::string& path, void* ctx) :
+    DbusSensor(sdbusplus::bus_t& bus, const std::string& path, void* ctx) :
         bus(bus), path(path),
         signal(
             bus,
@@ -51,7 +51,7 @@
 
   private:
     /** @brief sdbusplus bus client connection. */
-    sdbusplus::bus::bus& bus;
+    sdbusplus::bus_t& bus;
     /** @brief complete path for sensor */
     std::string path{};
     /** @brief service name for the sensor daemon */