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

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https://hg.mozilla.org/integration/gaia-central/rev/63e43c520bbd
Author: Jose Antonio Olivera Ortega <josea.olivera@gmail.com>
Desc: Merge pull request #14701 from jaoo/946309

Bug 946309 - Include operatorsizelimit for MMS in a new market. r=kaze

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https://hg.mozilla.org/integration/gaia-central/rev/7b5de984b376
Author: Jose Antonio Olivera Ortega <josea.olivera@gmail.com>
Desc: Bug 946309 - Include operatorsizelimit for MMS in a new market

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https://hg.mozilla.org/integration/gaia-central/rev/3b3e5519fc4d
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #14692 from askeing/950582

Bug 950582 - Xfail test_lockscreen_unlock_to_camera_with_passcode.py

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https://hg.mozilla.org/integration/gaia-central/rev/7867ffd80b37
Author: askeing <askeing@gmail.com>
Desc: Bug 950582 - Xfail test_lockscreen_unlock_to_camera_with_passcode.py