Allow only DNS64 reverse zone to be configured independently of the DNS64 clause

dns64 currently configures both the DNS64 synthesis and a DNS64 reverse zone.

If a customer is using RFC 7050 (IPV4ONLY.ARPA) or some other mechanism to publish the NAT64 prefix but not DNS64 the reverse zone synthesis is still needed.

Edited Sep 11, 2018 by Mark Andrews

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