fixed several pep8 issues

  * 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
Merge "fixed several pep8 issues"