qemu, xen: add missing deps on virtlockd/virtlogd sockets

qemu, xen: add missing deps on virtlockd/virtlogd sockets

The QEMU driver uses both virtlogd and virtlockd, while the Xen driver
uses virtlockd. The libvirtd.service unit contains deps on the socket
units for these services, but these deps were missed in the modular
daemons. As a result the virtlockd/virtlogd sockets are not started
when the virtqemud/virtxend daemons are started.

Reviewed-by: Jiri Denemark <jdenemar@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>