Listing builder differences for a buildbot-configs patch improved

Up until now, we updated the buildbot-configs repository to the "default" branch instead of "production" since we normally write patches against that branch.

However, there is a problem with this, buildbot-configs is always to be on the same branch as buildbotcustom. Otherwise, we can have changes land in one repository which require changes on the other one.

The fix was to simply make sure that both repositories are either on default or their associated production branches.

Besides this fix, I have landed two more changes:

1. Use the production branches instead of 'default'
• Use -p
2. Clobber our whole set up (e.g. ~/.mozilla/releng)
• Use -c

Here are the two changes:
https://hg.mozilla.org/build/braindump/rev/7b93c7b7c46a
https://hg.mozilla.org/build/braindump/rev/bbb5c54a7d42

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This work by Zambrano Gasparnian, Armen is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported License.