Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/292e9b1bc859
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #15412 from viorelaioia/bug_960526

Xfail test_sms_with_attachments with Bug 960537 as Bug 958555 was fixed

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https://hg.mozilla.org/integration/gaia-central/rev/6f3dfe8ad35c
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Xfail test_sms_with_attachments with the new bug

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https://hg.mozilla.org/integration/gaia-central/rev/3de7da3ac1fd
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #15511 from askeing/961579

Bug 961579 - Fix intermittent failure of test_camera_capture_video and ...

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https://hg.mozilla.org/integration/gaia-central/rev/e73b35dce1a1
Author: askeing <askeing@gmail.com>
Desc: Bug 961579 - Fix intermittent failure of test_camera_capture_video and test_camera_capture_photo

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https://hg.mozilla.org/integration/gaia-central/rev/b749544da7a6
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #15510 from askeing/961568

Bug 961568 - Fix intermittent failure of test_settings_airplane_mode.py

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https://hg.mozilla.org/integration/gaia-central/rev/5a3d28d6271a
Author: askeing <askeing@gmail.com>
Desc: Bug 961568 - Fix intermittent failure of test_settings_airplane_mode.py
Bumping manifests a=b2g-bump