Designate: Ensure overriding dns_port
Designate: Ensure overriding dns_port

In integration jobs we use non-default port (5322 instead of 53) for
Bind. This change ensures that we use the correct port number.

Change-Id: Ic416e6bd7ebfe4291bf28585d033acd9f7d3b7bc

openstack/puppet-openstack-integration,openstack/puppet-openstack-integration,openstack/puppet-openstack-integration