Use some nmcli con down/ups to workaround RHBZ #1739148
    
    Restarting NetworkManager.service doesn't seem to apply our
    newly-created static config in Rawhide any more (again!), since
    NetworkManager 1.20.0-0.5.fc31 landed. This seems to work around
    the bug.
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>