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: I9029cc722e7712633c15436bd3868d8c3209f567
diff --git a/control/json/manager.cpp b/control/json/manager.cpp
index 19d9d9b..0b1c45f 100644
--- a/control/json/manager.cpp
+++ b/control/json/manager.cpp
@@ -764,7 +764,7 @@
     }
 }
 
-void Manager::handleSignal(sdbusplus::message::message& msg,
+void Manager::handleSignal(sdbusplus::message_t& msg,
                            const std::vector<SignalPkg>* pkgs)
 {
     for (auto& pkg : *pkgs)