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CE upstream - 2018-11-16 16:21 UTC

Closes gitlab-ce#54068 and gitlab-ce#54110

See merge request gitlab-org/gitlab-ee!8488

EE: Improve variables support

See merge request gitlab-org/gitlab-ee!8483

This ensures that variables accept only string,
alongside also improves kubernetes_namespace,
improving validation and default value being set.

Mention limitation of requirements.txt in Dependency scanning docs

Closes gitlab-ce#52824

See merge request gitlab-org/gitlab-ee!8439

EE: Refactor Member#add_user for GitLab EE

See merge request gitlab-org/gitlab-ee!8471

Ports https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/22533 to EE

See merge request gitlab-org/gitlab-ee!8264

Update the cluster docs for Knative

See merge request gitlab-org/gitlab-ee!8465

Remove superfluous '-level'

See merge request gitlab-org/gitlab-ee!8490

Revert "Merge branch 'docs/split-front-page-ee' into 'master'"

See merge request gitlab-org/gitlab-ee!8498

This reverts merge request !7525

Merge branch 'ee-54093-the-default_value_for-gem-doesn-t-handle-actioncontroller-parameters-correctly' into 'master'

[EE] Replace the `default_value_for` gem with the `gitlab-default_value_with` gem which handles `ActionController::Parameters` correctly

Closes gitlab-ce#54093

See merge request gitlab-org/gitlab-ee!8473

EE port of 52385-search-bar-for-dashboard-list

See merge request gitlab-org/gitlab-ee!8125