Please switch gaia try to use the default branch of my mozharness user repository. Similar to bug 1008351. http://hg.mozilla.org/users/jford_mozilla.com/mozharness @ default
Actually, assigning to jhford. Please unassign and morph to back this out when you're done.
As soon as http://hg.mozilla.org/build/mozharness/rev/8bd5a04c10f1 is merged to production, this can be undone.