[wifi_test_utils] Fix forget network for Android S

In Android S, it will create multiple configured
networks with the same netwok id. It may cause we
forget the same network repeatedly. Add a list to
store removed network id and check before forget

Bug: 196188525
Test: Local test
Change-Id: I30352ba723bf77e2584fdd002ce46b8755567bdf
1 file changed
tree: a3904ae5dea7d898371a446c9fcf9b49fbde5d15
  1. acts/
  2. acts_tests/
  3. tools/
  4. wts-acts/
  5. Android.mk
  7. PREUPLOAD.cfg