Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/0ce660ecc56b
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #16565 from bebef1987/test_clock

Bug 971640 - Intermittents in all clock tests

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https://hg.mozilla.org/integration/gaia-central/rev/1f3e31dcced3
Author: Bebe <bebe@mozilla.ro>
Desc: wip

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https://hg.mozilla.org/integration/gaia-central/rev/b90481be5dec
Author: Dale Harvey <dale@arandomurl.com>
Desc: Bug 978038 - Add verbose flag to make test-integration. r=gaye
Bumping manifests a=b2g-bump