Few changes for Wi-Fi Stress Test

Add WIFI_IDLE_MS to 1min in Wi-Fi stress test. bug#3284797
Wake up device using PowerManagerService.userActivityWithForce instead
of full wake lock.
Turn screen on when running Wi-Fi tests.

Change-Id: Ib763136cef515eec8b1d25183cf7a84ae1038ef2
3 files changed