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

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https://hg.mozilla.org/integration/gaia-2_0/rev/b7fb774fbaf2
Author: Dave Hunt <dave.hunt@gmail.com>
Desc: Bumped gaiatest-v2.0 version to 0.2. r=me a=test-only

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https://hg.mozilla.org/integration/gaia-2_0/rev/fa0938cd46c6
Author: Dave Hunt <dave.hunt@gmail.com>
Desc: Bug 1011033 - Wait for homescreen to be loaded when restarting B2G. r=bsilverberg
Bumping manifests a=b2g-bump