autotest/autotest — pull request #68 by zhouqt (2011-11-10 12:44:23+00:00)
Title: client: tapfd-helper.py: run qemu-kvm command with os.system

tapfd-helper.py runs qemu-kvm command with util.system() function,
user can't get monitor prompt if setting monitor to stdio.
This patch will use os.system instead.

Signed-off-by: Qingtang Zhou