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: Ibd2a0b512bfb7caf65bfab64b271d194da520aac
diff --git a/host-cmd-manager.hpp b/host-cmd-manager.hpp
index 94cc6f1..f2fe373 100644
--- a/host-cmd-manager.hpp
+++ b/host-cmd-manager.hpp
@@ -32,7 +32,7 @@
      *  @param[in] bus   - dbus handler
      *  @param[in] event - pointer to sd_event
      */
-    explicit Manager(sdbusplus::bus::bus& bus);
+    explicit Manager(sdbusplus::bus_t& bus);
 
     /** @brief  Extracts the next entry in the queue and returns
      *          Command and data part of it.
@@ -92,10 +92,10 @@
      *
      *  @param[in] msg - the sdbusplus message containing the property
      */
-    void clearQueueOnPowerOn(sdbusplus::message::message& msg);
+    void clearQueueOnPowerOn(sdbusplus::message_t& msg);
 
     /** @brief Reference to the dbus handler */
-    sdbusplus::bus::bus& bus;
+    sdbusplus::bus_t& bus;
 
     /** @brief Queue to store the requested commands */
     std::queue<CommandHandler> workQueue{};