Reviewed by Adam Barth.

        Make the EWSes report queue position in white bubbles
        https://bugs.webkit.org/show_bug.cgi?id=39519

        This also fixes sorting of commit-queue patches
        to be in order of patch attachment.
        https://bugs.webkit.org/show_bug.cgi?id=33395

        This makes the various Queues post what patches they are about to process
        so that we can display a list of patches on status server pages, as well
        as report queue position in status bubbles.

        This is the first step towards creating a control-channel for the queues.
        Next step will be to have them read back the patches in order from the server
        and finally we will add the ability for the server to control that order.

        * Scripts/webkitpy/common/net/bugzilla.py:
         - Teach bugzilla how to parse attach_date for attachments.
        * Scripts/webkitpy/common/net/bugzilla_unittest.py:
         - Test that we're parsing dates correctly.
           This may have timezone issues for non-PST contributers, unsure.
        * Scripts/webkitpy/common/net/statusserver.py:
         - Post work items to the status server for display.
        * Scripts/webkitpy/tool/bot/patchcollection.py:
         - Call StatusServer.update_work_items
        * Scripts/webkitpy/tool/commands/earlywarningsystem_unittest.py:
         - Update unit test results now that we're posting work item list.
        * Scripts/webkitpy/tool/commands/queues.py:
         - Call StatusSever.update_work_items
         - Sort patches so that the server's list understands
           that the commit-queue gives priority to rollout patches.
         - I also fixed patch sorting per bug 33395 while I was here.
        * Scripts/webkitpy/tool/commands/queues_unittest.py:
         - Update results after update_work_items changes.
         - Test attachment sorting.
        * Scripts/webkitpy/tool/mocktool.py:
         - Add mock for update_work_items

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@59978 268f45cc-cd09-0410-ab3c-d52691b4dbfc