Merge changes from topics "user_remove_extra_user", "wifi_net_utils"

* changes:
  WifiServiceImpl: Use public EXTRA_USER for ACTION_USER_REMOVED
  wifi-service: Link net util libraries
tree: ff9091b0236cb0124c835a1eedb05a54e5af602f
  1. apex/
  2. service/
  3. PREUPLOAD.cfg