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: I0eb22958103519924e336a2260a4d48015848c3e
diff --git a/common_utility.hpp b/common_utility.hpp
index 15e2f2c..45c2230 100644
--- a/common_utility.hpp
+++ b/common_utility.hpp
@@ -16,7 +16,7 @@
  *  @param[in] interface - interface under the object path
  *  @return service name
  */
-std::string getService(sdbusplus::bus::bus& bus, const std::string& path,
+std::string getService(sdbusplus::bus_t& bus, const std::string& path,
                        const std::string& interface);
 
 /** @brief Call inventory-manager to add objects