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

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https://hg.mozilla.org/integration/gaia-central/rev/71b972d0b5f6
Author: Hubert Figuière <hub@figuiere.net>
Desc: Merge pull request #17624 from hfiguiere/bug988114

Bug 988114 - Hardcode the sha1 we want for the gaia-node-modules. r=yuren,kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/addd45c53d7d
Author: Hubert Figuière <hub@figuiere.net>
Desc: Bug 988114 - Update revision for gaia-node-modules. a=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/1ccd90950d7c
Author: Hubert Figuière <hub@figuiere.net>
Desc: Bug 988114 - Hardcode the sha1 we want for the gaia-node-modules. r=yuren
Bumping manifests a=b2g-bump