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

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https://hg.mozilla.org/integration/gaia-central/rev/17c58b0d99f1
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #13580 from bebef1987/fix_wifi

Bug 937105 - test_airplane_mode.py is failing

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https://hg.mozilla.org/integration/gaia-central/rev/e5e28c204e31
Author: Bebe <bebe@mozilla.ro>
Desc: Bug 937105 - test_airplane_mode.py is failing