Add wifi stability tests

This CL adds tests that look at connected RSSI stability over time.

Test: Done
Bug: 65563975


Change-Id: Ieabba81cffa65f7352dac8f338fd0e39ffe6066c
(cherry picked from commit 9736351e359eda247e2e01299f181490d8b9be7d)
2 files changed
tree: 0dd43a84ca0319a38aed58052b65ae673c3c5f66
  1. acts/
  2. tools/
  3. Android.mk
  4. PREUPLOAD.cfg