Merge changes from topic "natt-aidl+aidl-freeze" into qt-dev

* changes:
  Add AIDL parcelable for NattKeepalivePacketData
  Move NattKeepalivePacketData out of the framework
tree: 932f719f9a5937e8bb762693ea66f351bef5238f
  1. core/
  2. services/
  3. tests/