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/monitor-main.cpp b/fault-monitor/monitor-main.cpp
index f4e2182..92b332d 100644
--- a/fault-monitor/monitor-main.cpp
+++ b/fault-monitor/monitor-main.cpp
@@ -9,7 +9,7 @@
 int main(void)
 {
     /** @brief Dbus constructs used by Fault Monitor */
-    sdbusplus::bus::bus bus = sdbusplus::bus::new_default();
+    sdbusplus::bus_t bus = sdbusplus::bus::new_default();
 
 #ifdef MONITOR_OPERATIONAL_STATUS
     phosphor::led::Operational::status::monitor::Monitor monitor(bus);