Calyptos should validate network-config json InstanceDnsServers against host(s) providing DNS service

[nephomaniac]

Suggesting a 'validator' to check the DNS entries in the network json against the hosts providing the DNS service. For example:
Should we check the entries in "InstanceDnsServers" against the registered hosts providing the DNS service?
Not sure yet if this should check for 'any' ip that resides on the DNS hosts, or only the IP used to register the host with the service?

[shaon]

If we are to only match InstanceDnsServers with User Facing Services since it's the one providing DNS servers, then I think, InstanceDnsServers in this case is redundant in this case.