use io.StringIO in python3 in test_queue (avoid deadlock)
use io.StringIO in python3 in test_queue (avoid deadlock)

Change-Id: Idc9e8d9164c679a1b8b025b73272c21dc9c6d1e8

aldebaran/qibuild,aldebaran/qibuild,aldebaran/qibuild,aldebaran/qibuild