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

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https://hg.mozilla.org/integration/gaia-central/rev/e5afb2db4f9a
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #16953 from viorelaioia/bug_980274

Bug 980274 - Unxfail test_cost_control_ftu.py as Bug 979341 is fixed

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https://hg.mozilla.org/integration/gaia-central/rev/154eba1dba7b
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 980274 - Unxfail test_cost_control_ftu.py as Bug 979341 is fixed
Bumping manifests a=b2g-bump