Reviewed by Eric Seidel.

        The tool member variable should be called _tool
        https://bugs.webkit.org/show_bug.cgi?id=46160

        Created by find-and-replace.

        * Scripts/webkitpy/tool/commands/download.py:
        * Scripts/webkitpy/tool/commands/openbugs.py:
        * Scripts/webkitpy/tool/commands/queries.py:
        * Scripts/webkitpy/tool/commands/queues.py:
        * Scripts/webkitpy/tool/commands/queues_unittest.py:
        * Scripts/webkitpy/tool/commands/rebaseline.py:
        * Scripts/webkitpy/tool/commands/sheriffbot.py:
        * Scripts/webkitpy/tool/commands/upload.py:
        * Scripts/webkitpy/tool/multicommandtool.py:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@67916 268f45cc-cd09-0410-ab3c-d52691b4dbfc