Catch redis address error

What does this MR do?

Catches an error that is thrown when ipv6 is disabled, and redis is not running.

Why was this MR needed?

During build and asset compilation, we often do not have redis or postgres running.

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Fixes: omnibus-gitlab#2545 (closed)

cc\ @stanhu