Minor changes to the async DNS query JAVA API

1. refine the naming in DnsPacket and add more comment
2. add comment in DnsResolver

Test: built, flashed, booted
      atest DnsResolverTest DnsPacketTest

Change-Id: Ib482d079d6823fd1d9bff163427b7aad38374199
1 file changed
tree: 7ab5aa6f8bc8c22cf8e2917a7be1f8d95b43fe28
  1. core/
  2. services/
  3. tests/