Add NTP to the list of services stored in IPA masters LDAP subtree
    
    IPA masters can be configured as NTP servers but the status of this service
    can not be determined centrally from querying relevant LDAP subtree. This
    patch makes IPA master and replica publish the newly configured NTP service in
    their service container during installation.
    
    If the master was configured as NTP server, the NTP service entry will be
    created upon upgrade.
    
    https://fedorahosted.org/freeipa/ticket/5815
    https://fedorahosted.org/freeipa/ticket/5826
    
    Reviewed-By: Petr Spacek <pspacek@redhat.com>
    Reviewed-By: Martin Basti <mbasti@redhat.com>