Bumping gaia.json for 8 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_0/rev/6d7df7933753
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #21198 from KevinGrandon/bug_1017247_system_launch_regression

Bug 1017247 - [System] Remove on-homescreen class

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https://hg.mozilla.org/integration/gaia-2_0/rev/f71102892839
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #21402 from pivanov/bug-1034271

Bug 1034271 - [SMS] Background graphic is out of date r=julien

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https://hg.mozilla.org/integration/gaia-2_0/rev/f30f24c8db33
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #21573 from crdlc/bug-1036823

Bug 1036823 - [Vertical homescreen] Remove "install" message for bookmarks because it is not supported r=kgrandon

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https://hg.mozilla.org/integration/gaia-2_0/rev/e5d64888cd0a
Author: Albert <alberto.crespellperez@telefonica.com>
Desc: Merge pull request #21304 from acperez/bug-1029394

Bug 1029394 - Cannot change call forwarding rules unless the user disables them previously.r=jaoo

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https://hg.mozilla.org/integration/gaia-2_0/rev/611d0c5ab8a0
Author: Guillaume C. Marty <edo999@gmail.com>
Desc: Merge pull request #20610 from gmarty/bug-908300-Solution-Truncated-Headers

Bug 908300 - Solution for Truncated Headers

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https://hg.mozilla.org/integration/gaia-2_0/rev/1a52b63670da
Author: Kamil Leszczuk <kamituel@gmail.com>
Desc: Merge pull request #21403 from kamituel/Bug_948823_nfc_handover_manager_comments

Bug 948823: Rewrite comments so they're jsdoc compatible. Mark private m... r=alive

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https://hg.mozilla.org/integration/gaia-2_0/rev/b91bd322125f
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Merge pull request #21120 from Cwiiis/bug984792

Bug 984792 - Account for direction when swiping in task manager. r=alive

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https://hg.mozilla.org/integration/gaia-2_0/rev/707fff2a5f34
Author: Jan Jongboom <janjongboom@gmail.com>
Desc: Merge pull request #20967 from comoyo/bug995886

Bug 995886 - Homescreens overlap when process is killed when screen is off. r=timdream r=crdlc
Bumping manifests a=b2g-bump