Use a shorter socket path during testing

An absolute path to the test socket may become too long, especially now that GitLab Development Kit uses a deeply nested directory for gitlab-shell. Depending on the operating system there may be a low limit on socket path lengths (about 100 characters on OS X for instance). Using a relative path avoids this problem.

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• 8e27afa7 - Use a shorter socket path during testing

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assigned to @rspeicher

changed milestone to %9.2

merged

mentioned in commit 1cf14770