Merge changes from topic "remove-deferred-enable"

* changes:
  Share single instance of Handler
  Fix usage of wrong thread
  Rename Wifi threads to reduce confusion
  WifiServiceImpl - clean up before moving mode-independent API calls here
  WifiController: removed deferred enable
tree: b32371e0b49324e03a7701ef675e45b2eb38f196
  1. service/
  2. PREUPLOAD.cfg