Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_1/rev/bfce01e6a274
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #24350 from julienw/1071676-v2.1-run-tests

Bug 1071676 - [Travis] Run tests on v2.1 branch too r=me

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https://hg.mozilla.org/integration/gaia-2_1/rev/8e977b64c87f
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 1071676 - [Travis] Run tests on v2.1 branch too r=me
Bumping manifests a=b2g-bump