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

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https://hg.mozilla.org/integration/gaia-central/rev/f0be2c8b9ada
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #17796 from askeing/989898

Bug 989898 - Fix email manual setup steps of gaiatest

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https://hg.mozilla.org/integration/gaia-central/rev/df11cfee8774
Author: askeing <askeing@gmail.com>
Desc: Bug 989898 - Fix email manual setup steps of gaiatest
Bumping manifests a=b2g-bump