Host suspend notification may be useful not only to driver domains. For
example Whonix needs to resync time after suspend.
Thanks @adrelanos for help.
FixesQubesOS/qubes-issues#1663
(cherry picked from commit e0c875a367)
qvm-sync-clock running in background is killed as soon as
qubes-suspend.service is terminated.
Additionally restore --verbose option, which was the case (implicitly)
in previous qvm-run based code.
FixesQubesOS/qubes-issues#1795
(cherry picked from commit b19ba4dc2d)
