do partial host enrollment in domain level 0 replica install
    
    In order to unify domain-level specific replica installers to a single
    workflow some kind of host enrollment must be done also in domain level 0
    replica installation.
    
    Here the enrollment is done by directory manager using
    one-time password and only krb5.conf is configured to point to master KDC.
    
    Since host keytab is fetched during enrollment KDC installer no longer needs
    to request it during replica install.
    
    https://fedorahosted.org/freeipa/ticket/6434
    
    Reviewed-By: Stanislav Laznicka <slaznick@redhat.com>
    Reviewed-By: Jan Cholasta <jcholast@redhat.com>