CE port of "qa-staging-15-use-existing-users-ee"

See merge request gitlab-org/gitlab-ce!22864

Use existing users in tests

Closes gitlab-org/quality/staging#15

See merge request gitlab-org/gitlab-ee!8266

add guide for creating runbook

See merge request gitlab-org/gitlab-ce!22885

CE upstream - 2018-11-19 17:21 UTC

Closes gitlab-ce#54093, gitlab-ui#65, and gitlab-ui#95

See merge request gitlab-org/gitlab-ee!8510

Fix typo in js (props, specs)

See merge request gitlab-org/gitlab-ce!23103

see https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/22673

Increase rspec parallelization to 50

See merge request gitlab-org/gitlab-ce!23149

Update merge request submission preview docs

See merge request gitlab-org/gitlab-ee!8506

Update merge request file tree docs

See merge request gitlab-org/gitlab-ce!23187

Use stub_licensed_features to enable audit events

See merge request gitlab-org/gitlab-ee!8512

# Conflicts:
#	Gemfile.lock
#	app/services/projects/disable_deploy_key_service.rb
#	app/views/dashboard/merge_requests.html.haml
#	app/views/devise/shared/_tabs_ldap.html.haml
#	doc/install/requirements.md
#	package.json
#	spec/controllers/projects/deploy_keys_controller_spec.rb

[ci skip]

Check global feature directly on `License` class

Closes #8484

See merge request gitlab-org/gitlab-ee!8505

Match users better by their private commit email

Closes #54046

See merge request gitlab-org/gitlab-ce!23080

Smartcard authentication

See merge request gitlab-org/gitlab-ee!8120

Backport of ee/8120: Smartcard authentication

See merge request gitlab-org/gitlab-ce!23012

Upgrade @gitlab/svg to 1.38.0

See merge request gitlab-org/gitlab-ce!23177

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

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

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

Improve variables support

See merge request gitlab-org/gitlab-ce!23077

EE: Improve variables support

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

Add support for surfacing a link to the branch or tag name in push message…

Closes #51959

See merge request gitlab-org/gitlab-ce!22651

Global features should be checked directly on the license
class `external_authorization` is one of these features.

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

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

Private commit emails were introduced in !22560, but some parts of
GitLab were not updated to take account of them. This commit adds
support in places that were missed.