Reviewed by Adam Barth.

        The commit-queue should file bugs about flaky tests it encounters
        https://bugs.webkit.org/show_bug.cgi?id=50803

        This change got a bit big.  I also added a new config.urls file
        because I needed to share the view_source_url code with committervalidator.py.

        This adds a new class FlakyTestReporter which holds all the logic about
        reporting flaky tests to bugzilla.

        Right now this code knows how to look up bugs for flaky tests.
        If it can't find a bug filed from the commit-queue, it will open a new
        one, ccing the relevant people and adding information about the failure.

        It is not yet smart enough to chase down duplicate chains, or to include
        the actual failure diff.  But those can be added in later iterations.

        * Scripts/webkitpy/common/checkout/api.py:
        * Scripts/webkitpy/common/checkout/changelog.py:
        * Scripts/webkitpy/common/checkout/commitinfo.py:
        * Scripts/webkitpy/common/config/committervalidator.py:
        * Scripts/webkitpy/common/config/urls.py: Copied from WebKitTools/Scripts/webkitpy/tool/comments.py.
        * Scripts/webkitpy/common/net/bugzilla/bugzilla.py:
        * Scripts/webkitpy/tool/bot/flakytestreporter.py: Added.
        * Scripts/webkitpy/tool/bot/flakytestreporter_unittest.py: Copied from WebKitTools/Scripts/webkitpy/tool/comments.py.
        * Scripts/webkitpy/tool/bot/irc_command.py:
        * Scripts/webkitpy/tool/bot/sheriff.py:
        * Scripts/webkitpy/tool/commands/download.py:
        * Scripts/webkitpy/tool/commands/queues.py:
        * Scripts/webkitpy/tool/commands/queues_unittest.py:
        * Scripts/webkitpy/tool/comments.py:
        * Scripts/webkitpy/tool/mocktool.py:
        * Scripts/webkitpy/tool/steps/commit.py:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@73691 268f45cc-cd09-0410-ab3c-d52691b4dbfc