Merge changes from topics "vpnmove-getconnectionowneruid", "vpnmove-systemdefaultcallback", "vpnmove-vpntransportinfo"

* changes:
  Stop using mVpns in getConnectionOwnerUid.
  Add a VpnTransportInfo object.
  Add a registerSystemDefaultNetworkCallback method.
tree: e5c61cd5dd5a3a856228bbcbdc73c396ce6d5192
  1. core/
  2. framework/
  3. service/
  4. services/
  5. tests/
  6. OWNERS