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

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https://hg.mozilla.org/integration/gaia-central/rev/7f88fe2494cf
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #21698 from bebef1987/fix_time

Bug 1032468 - Intermittent test_clock_create_new_alarm.py

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https://hg.mozilla.org/integration/gaia-central/rev/ea47205c3528
Author: Bebe <bebe@mozilla.ro>
Desc: Bug 1032468 - Intermittent test_clock_create_new_alarm.py

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https://hg.mozilla.org/integration/gaia-central/rev/8671eedd5495
Author: Zbigniew Braniecki <gandalf@mozilla.com>
Desc: Bug 1022859 - Do not iterate over Object's prototype properties for l10n AST iterations. r=stas

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https://hg.mozilla.org/integration/gaia-central/rev/cdb5b9216470
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #21103 from zacc/bug_1028941

Bug 1028941 - gaiatest - Kill only FTU when doing restart, kill all runn...

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https://hg.mozilla.org/integration/gaia-central/rev/dba96ad8ab66
Author: Zac <zcampbell@mozilla.com>
Desc: Update poor grammar in comments, remove ability to killAll system apps

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https://hg.mozilla.org/integration/gaia-central/rev/bbcb3ae29f04
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 1028941 - gaiatest - Kill only FTU when doing restart, kill all running apps when doing a full reset
Bumping manifests a=b2g-bump