* DnsUpdateWriter publishes changes to NS, DS, A, AAAA records
for domains/hosts as appropriate using RFC 2136 DNS UPDATE protocol
* Static configuration separate from RegistryConfig
* Include dnsjava library as new third party dependency
to generate DNS protocol messages
* Expose /_dr/task/writeDns in RegistryTestServer
* Currently not included in BackendComponent
1. Turn ConsoleUiServlet into an action
2. Remove AbstractUiServlet, which fixes its threading bug
3. Use type-safe soy template parameters when rendering console
A follow-up change will add a new template parameter that renders the
payment page link on the navigation bar.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=117969638