Merge changes from topic "MDns_AIDL"

* changes:
  Freeze Mdns AIDL interface to V1
  Add MDNS aidl
tree: fb2cd43e95f734e2a429d9b9371f707583215445
  1. client-libs/
  2. common/
  3. .gitignore
  4. OWNERS
  5. PREUPLOAD.cfg
  6. TEST_MAPPING