Revert "Merge branch 'gitaly-mandatory-20180703-jv' into 'master'"

What does this MR do?

EE version of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/20402

Does this MR meet the acceptance criteria?

• Has been reviewed by a Backend maintainer
• End-to-end tests pass (package-and-qa manual pipeline job)

What are the relevant issue numbers?

Closes gitlab-qa#287 (closed)