Automatic updates: restart more daemons

By default only mcron is restarted. It was verified that it worked by
looking at the pid of guix-daemon, waiting for an automatic update to
happen and looking at the (new) pid of guix-daemon.

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>

guix-installer-vm-system.scm

@@ -158,7 +158,8 @@ needed for unattended upgrades to work.")
          (string-append "/run/current-system/profile"
                         "/share/guix-installer-vm/configs/"
                         "guix-installer-vm-system.scm"))
-        (schedule "0 * * * * "))))
+        (schedule "0 * * * * ")
+        (services-to-restart (list 'guix-daemon 'mcron 'ssh-daemon)))))
      (modify-services
       %base-services
       (guix-service-type config => (guix-configuration