Explicitly pass keytab to ipa-join
ipa-join defaults to /etc/krb5.keytab. Use ``-k paths.KRB5_KEYTAB`` to
write the keytab to /data share in containers.
Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
Reviewed-By: Francois Cami <fcami@redhat.com>