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

Change-Id: If6caa27a8c0597732050487d30ab4e8f7a05caaa
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/watchdog/watchdog_dbus.cpp b/watchdog/watchdog_dbus.cpp
index fb911eb..0ff0dbb 100644
--- a/watchdog/watchdog_dbus.cpp
+++ b/watchdog/watchdog_dbus.cpp
@@ -137,7 +137,7 @@
     constexpr auto extended = "org.freedesktop.DBus.Properties";
     constexpr auto function = "Get";
 
-    sdbusplus::message::message method;
+    sdbusplus::message_t method;
 
     if (0 == dbusMethod(path, interface, function, method, extended))
     {
@@ -157,7 +157,7 @@
                 return true;
             }
         }
-        catch (const sdbusplus::exception::exception& e)
+        catch (const sdbusplus::exception_t& e)
         {
             log<level::ERR>(
                 fmt::format("Failed to read CurrentHostState property ({})",