Bumping gaia.json for 5 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/38f10407c66d
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #13709 from viorelaioia/bug-938146

Bug 938146 - Put testvars skip into test_contacts_import_from_gmail

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https://hg.mozilla.org/integration/gaia-central/rev/485de82e210d
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 938146 - Put testvars skip into test_contacts_import_from_gmail

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https://hg.mozilla.org/integration/gaia-central/rev/8497221b23d4
Author: zacc <zcampbell@mozilla.com>
Desc: Bug 915138 - Python Change test_cards_view_with_three_apps.py to Hamachi failure only

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https://hg.mozilla.org/integration/gaia-central/rev/260273fb4965
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Merge pull request #13750 from zacc/bug_939114

Bug 939114 - Python test_camera_x tests failing

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https://hg.mozilla.org/integration/gaia-central/rev/9e2fdea9715a
Author: zacc <zcampbell@mozilla.com>
Desc: Bug 939114 - Python test_camera_x tests failing