Update references to deprecated `repos_path` configuration key to avoid

## What does this MR do?

Update references to deprecated `repos_path` configuration key to avoid errors when updating GitLab from older versions

## Why was this MR needed?

Users were reporting errors when upgrading from GitLab 6.7

## What are the relevant issue numbers?

https://gitlab.com/gitlab-org/omnibus-gitlab/issues/1464

See merge request !6350