Setup settings properly

What does this MR do?

This MR is really just to make CE and EE consistent when it comes to setting up Settings.

Why was this MR needed?

In EE, there is at least one place in the code where we use the LDAP Settings in such a way as to need them to be setup in a particular way. If we don't do this, then at some point a Hash is returned, and we cannot use the typical dot syntax to access its values.

See https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/2690

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests added for this feature/bug
• Review
  • Has been reviewed by UX
  • Has been reviewed by Frontend
  • Has been reviewed by Backend
  • Has been reviewed by Database
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together