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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