Merge changes I335e82e2,I84ba363d,I8f18083b,I854a952d,I00e23441

* changes:
  Remove per-user preference when the user is removed
  Expose the enterprise per-profile networking API.
  Implement setNetworkPreferenceForUser.
  Public API for per-profile network preference.
  Add tests for setNetworkPreferenceForUser