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

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https://hg.mozilla.org/integration/gaia-central/rev/dfef5388da07
Author: James Lal <james@lightsofapollo.com>
Desc: Merge pull request #19259 from lightsofapollo/travisactionall

Bug 1010530 - Add a binary to run all tests in a travis ci test suite +s...

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https://hg.mozilla.org/integration/gaia-central/rev/5542883a9afe
Author: James Lal <james@lightsofapollo.com>
Desc: Bug 1010530 - Add a binary to run all tests in a travis ci test suite +shepherd
Bumping manifests a=b2g-bump