Forget networks before wifi firmware crash

This CL has below changes:
- Reduce the defult sleep time to wait firmware restart
- Forget network before firmware crash to prevent DUT
  connects back to AP automatically

Bug: 120239655
Test: Local
Change-Id: I32da9e64ea83c0e5c52ee64580de18f85adfad65
1 file changed
tree: cc53ef12547b5cfc456aae43cb2e1f70de8bd20e
  1. acts/
  2. tools/
  3. wts-acts/
  4. Android.mk
  5. PREUPLOAD.cfg