Merge changes from topic "am-4740011bd6e84b87ab92eade195f1e04" into rvc-qpr-dev-plus-aosp

* changes:
  Switch back to using stable interfaces for DNS resolver. am: 0d234b06 am: 0d90689c am: 64210f42
  [automerger skipped] Freeze IDnsResolver to v5. am: fc3a5314 am: fe12b337 am: 9223139e -s ours
  [automerger skipped] Support DNS64 synthesis using externally-discovered prefixes. am: 346737c0 am: f697187a am: e37b2b98 -s ours