GitLab

Connection multiplexing results in unexpected hangs or resets when used
by our runner scripts, so disable it until the root cause is found and
resolved upstream.

Bug: 900790
Change-Id: I5025a5d652cdcbfe0c206fc4bf42366efbee07be
Reviewed-on: https://chromium-review.googlesource.com/c/1359489Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613377}