Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_2/rev/4f7b09a913ca
Author: Sherman Chen <shamenchens@users.noreply.github.com>
Desc: Merge pull request #28786 from shamenchens/Bug1127975-uplift

Bug 1127975 - Uplift bug 1127975 to v2.2, r=kgrandon

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https://hg.mozilla.org/integration/gaia-2_2/rev/6281402c066a
Author: Gareth Aye <gaye@mozilla.com>
Desc: Fix --runtime cli arg passed to marionette-mocha invocation

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https://hg.mozilla.org/integration/gaia-2_2/rev/714df31aa43b
Author: gaye <gaye@mozilla.com>
Desc: Bug 1127975 - Retry marionette tests on failure to rule out harness failures

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https://hg.mozilla.org/integration/gaia-2_2/rev/d1934fd641f4
Author: Sherman Chen <shamen.chens@gmail.com>
Desc: Bug 1127975 - Bump gaia-node-modules.revision to use es6-promise