AI 144620: Clean up interface between NetworkLocationProvider and LocationManagerService (part 1)

  Move broadcast receivers for wifi scan results and battery status
  from LocationManagerService to NetworkLocationProvider
  Add a Service for the NetworkLocationProvider, so we can install it from its
  own thread rather than from BOOT_COMPLETED or callback from LocationManagerService.
  (this Service was also required for receiving Intents in NetworkLocationProvider)
  BUG=1729031

Automated import of CL 144620