clock: handle different service names
clock: handle different service names

Restarting ntpd involves two different service names (thanks
again, distro maintainers, much appreciated)

Signed-off-by: Dan Mick <b07550071eaa6a9296289c43bbd6c90559196431@redhat.com>

SUSE/teuthology,dmick/teuthology,ktdreyer/teuthology,SUSE/teuthology,SUSE/teuthology,ktdreyer/teuthology,dmick/teuthology,ceph/teuthology,dmick/teuthology,ceph/teuthology