Merge branch 'ce-to-ee-2018-09-01' into 'master'

app/assets/javascripts/ide/components/repo_file.vue

app/assets/stylesheets/framework/typography.scss

app/assets/stylesheets/framework/variables.scss

app/assets/stylesheets/page_bundles/ide.scss

app/assets/stylesheets/pages/diff.scss

app/helpers/submodule_helper.rb

app/models/concerns/triggerable_hooks.rb

app/workers/background_migration_worker.rb

changelogs/unreleased/37356-relative-submodule-link.yml

...47765-group-visibility-error-due-to-string-conversion.yml

changelogs/unreleased/ide-row-hover-scroll.yml

...eased/remove-background-migration-worker-feature-flag.yml

changelogs/unreleased/sh-fix-confidential-note-option.yml

changelogs/unreleased/update-padding-markdown.yml

lib/gitlab/git_access.rb

lib/gitlab/import_export/project_tree_restorer.rb

qa/qa/page/view.rb

spec/controllers/projects/hooks_controller_spec.rb

spec/helpers/submodule_helper_spec.rb

spec/javascripts/ide/components/repo_file_spec.js