Use the common timer class

The common timer class from sdbusplus offers all the timer goodness that
we currently use. The unit test is also no longer needed (and has been
added to sdbusplus's version of the timer.hpp implementation).

Change-Id: I278817489433a29ca739f70fdacd8bb897797d66
Signed-off-by: Vernon Mauery <vernon.mauery@linux.intel.com>
diff --git a/softoff/mainapp.cpp b/softoff/mainapp.cpp
index 3b153a8..f6a52ac 100644
--- a/softoff/mainapp.cpp
+++ b/softoff/mainapp.cpp
@@ -16,12 +16,12 @@
 #include "config.h"
 
 #include "softoff.hpp"
-#include "timer.hpp"
 
 #include <systemd/sd-event.h>
 
 #include <phosphor-logging/elog-errors.hpp>
 #include <phosphor-logging/elog.hpp>
+#include <sdbusplus/timer.hpp>
 #include <xyz/openbmc_project/State/Host/error.hpp>
 
 // Return -1 on any errors to ensure we follow the calling targets OnFailure=