Bumping gaia.json for 4 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/6a5614013dc0
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #15246 from AndreiH/958543

Bug 958543 - Xfail test_unlock_to_camera_with_passcode

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https://hg.mozilla.org/integration/gaia-central/rev/29fcaf6d52ca
Author: Andrei Hutusoru <andreihutusoru@P5069.(none)>
Desc: Bug 958543 - Xfail test_unlock_to_camera_with_passcode

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https://hg.mozilla.org/integration/gaia-central/rev/1b7aef5683fb
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #15193 from timdream/keyboard-launch-on-boot2

Bug 958391 - keyboard.launch-on-boot, r=gary

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https://hg.mozilla.org/integration/gaia-central/rev/28506b726e58
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 958391 - keyboard.launch-on-boot

Additionally, prevent it being queried twice if there is already some
layouts running