Enable the following off-by-default checks:
* [H106] Don't put vim configuration in source files.
* [H203] Use assertIs(Not)None to check for None.
* [H204] Use assert(Not)Equal to check for equality.
* [H205] Use assert(Greater|Less)(Equal) for comparison.
* [H210] Require ‘autospec’, ‘spec’, or ‘spec_set’ in
mock.patch/mock.patch.object calls
* [H904] Delay string interpolations at logging calls.
Fix code that failed [H904]. Nothing else failed the new added checks.
Change-Id: I727c944aad04298de07bcdd1d0008dcb9ffe32e9
c693d5d04f