[ST03] Add test dns server for integration tests

Bug: 139774492
Test: atest DnsAnswerProviderTest TestDnsServerTest
Change-Id: Ia5039a47f4b818efb09aab8174beb9d921339c3d
3 files changed
tree: 1b77df8ed01f075e51e49f3e6239dc49d1d49c8a
  1. staticlibs/