Since commit @ae2163f8, only active client connections or running
domains are allowed to inhibit daemon shutdown. The man page however
wasn't updated appropriately.
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1325066
Signed-off-by: Erik Skultety <eskultet@redhat.com>
Reviewed-by: Martin Kletzander <mkletzan@redhat.com>