* E121: continuation line under-indented for hanging indent
* E122: continuation line missing indentation or outdented
* E123: closing bracket does not match indentation of opening bracket's line
* E124: closing bracket does not match visual indentation
* E126: continuation line over-indented for hanging indent
* E127: continuation line over-indented for visual indent
* E128: continuation line under-indented for visual indent
* E265: block comment should start with '# '
* E711: comparison to None should be 'if cond is None:'
Also enabled checks for those issues in tox.ini and updated
allowed versions of hacking.
Change-Id: I24a23344e6e5cb54ac494de1a3eeec51eb7832a5
8f64754daa