Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/f2274c0c94a9
Author: BavarianTomcat <tomcat@mozilla.com>
Desc: Revert "Bug 1006357 - make test agent to run tests from all apps locally and in travis" for build bustages

This reverts commit f382b51dc36de20de9ad06bb1798f8300dd164a8.
Bumping manifests a=b2g-bump