Enable some off-by-default checks
Enable some off-by-default checks

Some of the available checks are diskabled by default, like:
[H106] Don't put vim configuration in source files;
[H203] Use assertIs(Not)None to check for None.

Change-Id: Ib822b3b4cb9ae1176a8d69bbc0ab45126adc1bab

stackforge/bandit,pombredanne/bandit,chair6/bandit,stackforge/bandit,pombredanne/bandit