Merge changes Ia68f482a,I4911e214,Ied379654,I66d18512,Ie8e1bd63

* changes:
  Check registering system default callback needs NETWORK_SETTINGS.
  Move VPN code from ConnectivityService to VpnManagerService.
  Add a skeleton VpnManagerService, and start it on boot.
  Convert LockdownVpnTracker to NetworkCallbacks.
  Minor fixes to VpnTransportInfo.
tree: cbe74178fe73a2d4c651e90f875a02acd2c4308b
  1. framework/
  2. service/
  3. OWNERS