Reviewed by Adam Barth.

        Move buildbot.py into its own module so we can split it out into one-file-per-class
        https://bugs.webkit.org/show_bug.cgi?id=50806

        We're adding more buildbot logic these days, so it makes sense
        to give buildbot its own module.

        * Scripts/webkitpy/common/net/buildbot/__init__.py: Added.
        * Scripts/webkitpy/common/net/buildbot/buildbot.py: Renamed from WebKitTools/Scripts/webkitpy/common/net/buildbot.py.
        * Scripts/webkitpy/common/net/buildbot/buildbot_unittest.py: Renamed from WebKitTools/Scripts/webkitpy/common/net/buildbot_unittest.py.
        * Scripts/webkitpy/common/net/failuremap.py:
        * Scripts/webkitpy/common/net/regressionwindow.py:
        * Scripts/webkitpy/tool/commands/rebaseline.py:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@73776 268f45cc-cd09-0410-ab3c-d52691b4dbfc