Source installs fail in gitlab:setup with "Failed to connect to Gitaly..."

Summary

Can not install GitLab 10.8 from source. When running the gitlab:setup rake task it fails because it attempts to connect to gitaly, which is not yet installed.

Steps to reproduce

Follow the instructions here: https://docs.gitlab.com/ce/install/installation.html

What is the current bug behavior?

bundle exec rake gitlab:setup fails with:

Failed to connect to Gitaly...
Error: 14:Connect Failed

What is the expected correct behavior?

Success

Output of checks

N/A - gitlab not installed yet.

Possible fixes

Revert !18481 (merged)