Ensure that we kill ruby Gitlab::Git::Popen reader threads

Jacob Vosmaerrequested to merge
ruby-thread-exception into master

Closes #1461 (closed).

In the Popen Ruby class we do IO in reader threads, yet we close the file descriptors on the main thread. During an early return that can lead to an IOError exception in the reader threads. This change fixes that.

Edited by GitLab Release Tools Bot

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