Create systemd-resolved configuration on update
    
    Create systemd-resolved drop-in and restart the service when the drop-in
    config file is missing and /etc/resolv.conf points to stub resolver
    config file.
    
    Signed-off-by: Christian Heimes <cheimes@redhat.com>
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>