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

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https://hg.mozilla.org/integration/gaia-central/rev/0f0b5b641277
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #15262 from KevinGrandon/bug_959107_mobile_conn_shim

Bug 959107 - TypeError: conn.setRoamingPreference is not a function r=me

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https://hg.mozilla.org/integration/gaia-central/rev/5dbbcce5305b
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 959107 - TypeError: conn.setRoamingPreference is not a function
Bumping gaia.json for 2 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/ef2b337289f9
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Merge pull request #15266 from jonallengriffin/gaiatest

Bug 959280 - Bump gaiatest to 0.21.3, r=bsilverberg

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https://hg.mozilla.org/integration/gaia-central/rev/32abd362865f
Author: Jonathan Griffin <jgriffin@mozilla.com>
Desc: Bug 959280 - Bump gaiatest to 0.21.3, r=bsilverberg