WifiNetworkFactory: Trigger periodic scans

Trigger periodic scans to find networks matching the active network request.
This CL only adds the scan interval management. The actual processing of
the scan results to find the match will be added in a follow up CL.

Bug: 113878056
Test: Unit tests

Change-Id: I406fa2de5527064134ce7d41f6b48f28464c7261
3 files changed
tree: 5e0fb071497b38f9db469516b6cc5c16dcb2ad4d
  1. service/
  2. PREUPLOAD.cfg