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

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https://hg.mozilla.org/integration/gaia-central/rev/84ac8b2678f8
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #17798 from askeing/989905

Bug 989905 - Fix test_lockscreen_unlock_to_emergency_call_screen.py

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https://hg.mozilla.org/integration/gaia-central/rev/3edabaa0315a
Author: askeing <askeing@gmail.com>
Desc: Bug 989905 - Fix test_lockscreen_unlock_to_emergency_call_screen.py

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https://hg.mozilla.org/integration/gaia-central/rev/39f6c4cb4956
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #17795 from askeing/989892

Bug 989892 - fix test_call_log_all_calls.py

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https://hg.mozilla.org/integration/gaia-central/rev/2439cf7b74d6
Author: askeing <askeing@gmail.com>
Desc: Bug 989892 - fix test_call_log_all_calls.py

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https://hg.mozilla.org/integration/gaia-central/rev/2f364dd656e5
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #17793 from askeing/989247

Bug 989247 - modify the gaiatest camera app for gaia camera change

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https://hg.mozilla.org/integration/gaia-central/rev/06c7511e9692
Author: askeing <askeing@gmail.com>
Desc: Bug 989247 - modify the gaiatest camera app for gaia camera change
Bumping manifests a=b2g-bump