Remove a bunch of unused webkitpy code from tool/, common/checkout/ and common/config/

Tools/Scripts/webkitpy/tool/steps/__init__.py

 # Copyright (C) 2010 Google Inc. All rights reserved.
 #
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 # modification, are permitted provided that the following conditions are
 # met:
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 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
 # in the documentation and/or other materials provided with the
 # distribution.
 #     * Neither the name of Google Inc. nor the names of its
 # contributors may be used to endorse or promote products derived from
 # this software without specific prior written permission.
 #
 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 # FIXME: Is this the right way to do this?
-from webkitpy.tool.steps.addsvnmimetypeforpng import AddSvnMimetypeForPng
-from webkitpy.tool.steps.checkstyle import CheckStyle
-from webkitpy.tool.steps.cleanworkingdirectory import CleanWorkingDirectory
-from webkitpy.tool.steps.commit import Commit
 from webkitpy.tool.steps.confirmdiff import ConfirmDiff
-from webkitpy.tool.steps.discardlocalchanges import DiscardLocalChanges
-from webkitpy.tool.steps.ensurebugisopenandassigned import EnsureBugIsOpenAndAssigned
-from webkitpy.tool.steps.ensurelocalcommitifneeded import EnsureLocalCommitIfNeeded
-from webkitpy.tool.steps.haslanded import HasLanded
-from webkitpy.tool.steps.obsoletepatches import ObsoletePatches
 from webkitpy.tool.steps.options import Options
-from webkitpy.tool.steps.postdiff import PostDiff
-from webkitpy.tool.steps.promptforbugortitle import PromptForBugOrTitle
-from webkitpy.tool.steps.reopenbugafterrollout import ReopenBugAfterRollout
-from webkitpy.tool.steps.revertrevision import RevertRevision
-from webkitpy.tool.steps.runtests import RunTests