Merge "Replace Handler with Executor for async DNS API" am: 44bd665c9e am: b856fc1410
am: aef7db0037

Change-Id: Ia2305094fe66017fbdfdc18b2c7284452ac90036
tree: 12f70ea69d8862a36b7eafe19bf8b9837caf11c8
  1. core/
  2. services/
  3. tests/