Reviewed by Adam Barth.

        r63004 broke some python tests
        https://bugs.webkit.org/show_bug.cgi?id=42007

        AbstractStep now checks options.no_squash and options.squash, so
        they needed to have real values. Mock would return an object for those,
        which would then act as if the values were True.

        * Scripts/webkitpy/tool/commands/commandtest.py:
        * Scripts/webkitpy/tool/commands/download_unittest.py:
        * Scripts/webkitpy/tool/commands/stepsequence.py:
        * Scripts/webkitpy/tool/commands/upload_unittest.py:
        * Scripts/webkitpy/tool/mocktool.py:
        * Scripts/webkitpy/tool/steps/closebugforlanddiff_unittest.py:
        * Scripts/webkitpy/tool/steps/preparechangelog_unittest.py:
        * Scripts/webkitpy/tool/steps/steps_unittest.py:
        * Scripts/webkitpy/tool/steps/updatechangelogswithreview_unittest.py:
        * Scripts/webkitpy/tool/steps/validatereviewer_unittest.py:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@63020 268f45cc-cd09-0410-ab3c-d52691b4dbfc