Repository#refs_contains_sha

Repository#refs_contains_sha needs to be pushed into Gitlab::Git and migrated. Or faked, but probably it needs to be migrated.

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Stages:

• RPC Design: gitaly-proto!140 (merged)

• ~"Client Implementation": gitlab-org/gitlab-ce!16789

• Server Implementation: !537 (merged)

• ~"Acceptance Testing": #1008 (closed), #1009 (closed)

RPC Endpoints:

• RefService::BranchNamesContainingCommit
• RefService::TagNamesContainingCommit

Known Client Routes:

• commit show page ajax request: CommitController#branches

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