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/fault-monitor/operational-status-monitor.hpp b/fault-monitor/operational-status-monitor.hpp
index 3fa995d..3b67edb 100644
--- a/fault-monitor/operational-status-monitor.hpp
+++ b/fault-monitor/operational-status-monitor.hpp
@@ -39,7 +39,7 @@
      *
      *  @param[in] bus -  D-Bus object
      */
-    explicit Monitor(sdbusplus::bus::bus& bus) :
+    explicit Monitor(sdbusplus::bus_t& bus) :
         bus(bus),
         matchSignal(bus,
                     "type='signal',member='PropertiesChanged', "
@@ -54,7 +54,7 @@
 
   private:
     /** @brief sdbusplus D-Bus connection. */
-    sdbusplus::bus::bus& bus;
+    sdbusplus::bus_t& bus;
 
     /** @brief sdbusplus signal matches for Monitor */
     sdbusplus::bus::match_t matchSignal;
@@ -70,7 +70,7 @@
      *
      * @param[in] msg - The D-Bus message contents
      */
-    void matchHandler(sdbusplus::message::message& msg);
+    void matchHandler(sdbusplus::message_t& msg);
 
     /**
      * @brief From the Inventory D-Bus object, obtains the associated LED group