Use some nmcli con down/ups to workaround RHBZ #1727411
Restarting NetworkManager.service doesn't seem to apply our
newly-created static config in Rawhide any more, since
NetworkManager 1.20.0-0.3.fc31 landed. This seems to work around
the bug.
Signed-off-by: Adam Williamson <awilliam@redhat.com>