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
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.
Reviewed-By: Stanislav Laznicka <email@example.com>
Reviewed-By: Jan Cholasta <firstname.lastname@example.org>