Figure out the work needed for DNS service

[aozarov]

https://developers.google.com/resources/api-libraries/documentation/dns/v1/java/latest/

[ajkannan]

Closing this issue because gcloud-java-dns was implemented by @mderka and released in version 0.1.7.