Visibility level restrictions apply to admins when forking a project

Summary

In the settings, under "Visibility and Access Controls", where you can set visibility level restrictions, there is some text that says:

Selected levels cannot be used by non-admin users for projects or snippets. If the public level is restricted, user profiles are only visible to logged in users.

However... when private visibility level is set to restricted, an admin is unable to make a (private) fork of a private project.

Steps to reproduce

• Set private visibility level to restricted in application_settings, under "Visibility and Access Controls".
• As an admin, fork a project that has private visibility

What is the current bug behavior?

Fork Error appears:

You tried to fork group / project but it failed for the following reason:

– Visibility level visibilitylevel|public is not allowed since the fork source project has lower visibility.

[Try to fork again]

What is the expected correct behavior?

Visibility levels restrictions do not apply to the admin. The fork appears and has private visibility level.

OR

The help text in the settings is updated to reflect the current behaviour.

Results of GitLab environment info

Expand for output related to GitLab environment info

System information
System:     
Current User:   git
Using RVM:  no
Ruby Version:   2.3.3p222
Gem Version:    2.6.6
Bundler Version:1.13.7
Rake Version:   10.5.0
Redis Version:  3.2.5
Git Version:    2.13.0
Sidekiq Version:5.0.0
Go Version: unknown
GitLab information
Version:    9.4.3
Revision:   b125d21
Directory:  /opt/gitlab/embedded/service/gitlab-rails
DB Adapter: postgresql
URL:        http://gitlab.mycompany.com
HTTP Clone URL: http://gitlab.mycompany.com/some-group/some-project.git
SSH Clone URL:  git@gitlab.mycompany.com:some-group/some-project.git
Using LDAP: no
Using Omniauth: no
GitLab Shell
Version:    5.3.1
Repository storage paths:

• default: /data/gitlab/git-data/repositories Hooks: /opt/gitlab/embedded/service/gitlab-shell/hooks Git: /opt/gitlab/embedded/bin/git