autotest/virt-test — pull request #1831 by will-Do (2014-09-11 11:36:36+00:00)
Title: Prevent autotest job log display foreground

When open a subprocess to run autotest job, it will print the job log
in the terminal, so avoid this mess messages by redirecting both
stdout and stderr to PIPE.

Signed-off-by: Yanbing Du