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: I223d58649a21565678bd7ef78d955b30d3fd6d84
diff --git a/manager/group.hpp b/manager/group.hpp
index 520ba43..aec0e85 100644
--- a/manager/group.hpp
+++ b/manager/group.hpp
@@ -41,8 +41,8 @@
      * @param[in] serialize - Serialize object
      * @param[in] callBack  - Custom callback when LED group is asserted
      */
-    Group(sdbusplus::bus::bus& bus, const std::string& objPath,
-          Manager& manager, Serialize& serialize,
+    Group(sdbusplus::bus_t& bus, const std::string& objPath, Manager& manager,
+          Serialize& serialize,
           std::function<void(Group*, bool)> callBack = nullptr) :
 
         GroupInherit(bus, objPath.c_str(), GroupInherit::action::defer_emit),