capture_replay_tests: Don't shadow subprocess import. Rename local variable, so using subprocess.Timeout does not result in an exception. This patch fixes the test timeout counter. Bug: angleproject:5742 Change-Id: Ib6991bc58df6ea653f765dfe9f6117add75b85db Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2748339 Commit-Queue: Lubosz Sarnecki <lubosz.sarnecki@collabora.com> Reviewed-by: Cody Northrop <cnorthrop@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org>