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: If9a7314dade153dd7dbd149a76352aca8257839d
diff --git a/ubi/activation_ubi.hpp b/ubi/activation_ubi.hpp
index 957ee06..26d4209 100644
--- a/ubi/activation_ubi.hpp
+++ b/ubi/activation_ubi.hpp
@@ -16,7 +16,7 @@
 class RedundancyPriorityUbi : public RedundancyPriority
 {
   public:
-    RedundancyPriorityUbi(sdbusplus::bus::bus& bus, const std::string& path,
+    RedundancyPriorityUbi(sdbusplus::bus_t& bus, const std::string& path,
                           Activation& parent, uint8_t value) :
         RedundancyPriority(bus, path, parent, value)
     {
@@ -60,7 +60,7 @@
      *created as part of the activation process. **/
     bool ubiVolumesCreated = false;
 
-    void unitStateChange(sdbusplus::message::message& msg) override;
+    void unitStateChange(sdbusplus::message_t& msg) override;
     void startActivation() override;
     void finishActivation() override;
 };