Improve code style aka PEP8

_pep8_ package is updated, in the newer version is also recommending:

* Comments should start with `# `. Correct: `# my nice comment`, Wrong: `#my nice comment`
* Checking if some element is not in a list should be `if elem not in my_list` instead of `if not elem in list`
* Checking if some object is not True or False should be `if obj is not True` or `if obj is not False` instead of `if not obj is True` or `if not obj is False` respectively
* Comments should follow the indentation

Also have added `unittest.skip` decorator to ui.test_sso module.