ipatests/test_integration/test_server_del.py: Enable dns in fw for dnssec
test_install_dns_on_replica1_and_dnssec_on_master now also enables the
dns servive in the firewall of the master.
See: https://pagure.io/freeipa/issue/7755
Signed-off-by: Thomas Woerner <twoerner@redhat.com>
Reviewed-By: Christian Heimes <cheimes@redhat.com>