Merge pull request #21075 from vingtetun/bug1028933-landing

Bug 1028933 - Hide the context menu ui when the homescreen is not visibl...
Merge pull request #21088 from KevinGrandon/lightsofapollo-bug-1027935

Bug 1027935 - Correctly handle pending upgrades as well as pause/resume of upgrade downloads
Merge pull request #21121 from KevinGrandon/AntonioMA-bug1027708_3

Bug 1027708 - Delay setting the collection datastore listeners until the datastore initial read
Conflicts:
	tests/python/gaia-ui-tests/gaiatest/tests/tbpl-manifest.ini
Merge pull request #20774 from 6a68/bug-1027950-settings-fmd-onerror-handlers

Bug 1027950 - [Settings][Find My Device] Do not attach handlers inside onerror callback
Conflicts:
	apps/settings/elements/findmydevice.html
Merge branch 'v2.0' of https://github.com/mozilla-b2g/gaia into v2.0