Enhance airgap linter to reduce false positives: (#1635)
Enhance airgap linter to reduce false positives: (#1635)

- make it aware of VIPs
- Make it not fail on mesos-dns addresses with ports
vishnu2kmohan/dcos-commons,mesosphere/dcos-commons,vishnu2kmohan/dcos-commons,mesosphere/dcos-commons,mesosphere/dcos-commons,vishnu2kmohan/dcos-commons,vishnu2kmohan/dcos-commons,vishnu2kmohan/dcos-commons,mesosphere/dcos-commons,mesosphere/dcos-commons