Gitaly cleanup (!152) · Merge requests · GitLab.org / gitlab-workhorse

Some cleanup in Gitaly code.

assume that gitlab-rails sends GitalyAddress. Valid because of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/10447
assume that gitlab-rails sends a fully populated Repository message. Valid because of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/10343
use pre-built Repository message from API responses. This is something we missed in https://gitlab.com/gitlab-org/gitlab-workhorse/merge_requests/143

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