Sort debug options in the message pane by string. This makes it
much easier to find what you need, especially when we're trying
to help users. Previously, they were sorted by their enum values.

(cherry picked from commit de3daf040b09dfa719f7465b0eb29d276c75edcc)
Merge remote-tracking branch 'github/build-bot-2.1.x' into bleeding-edge-2.1.x
2014.10.26-23.00