turn off clean log enforcement in stress tests

d-g previously had logic around clean log enforcement around
stress tests. However we made an explicit option in change

I50944ad64bec948504a0124ea423a0f96f8a8361

Use that instead.

Change-Id: Ib96b6e6de104a71bc59fd5ea75d2f3897221e178
Merge "turn off clean log enforcement in stress tests"