Enable checks for E711, E712 and E713

* E711 comparison to None should be 'if cond is None:'
* E712 comparison to True should be 'if cond is True:' or 'if cond:'
* E713 test for membership should be 'not in'

Change-Id: I1481209a85fa6db0343d0111e2b19d9fab4538a7
Merge "Enable checks for E711, E712 and E713"