Merge "Add AIDL for registering ConnectivityDiagnosticCallbacks." am: 8f1c6d2bfd am: a358c3c92b am: b3d88f7fae

Change-Id: Iec4dcf4c39edb8994ed72b9550845ea5962e836a
tree: bbde909bbfe1056d5807ac5f38d62d19f7d0ac6f
  1. core/
  2. services/
  3. tests/