Features:
+* logind: make the Suspend()/Hibernate() bus calls wait for the for
+ the job to be completed. before returning, so that clients can wait
+ for "systemctl suspend" to finish to know when the suspending is
+ complete.
+
* sd_notify("SHUTDOWN=1") to fix a dbus activation race.
http://lists.freedesktop.org/archives/systemd-devel/2014-July/020983.html