autotest/virt-test — pull request #1401 by yangdongsheng (2014-01-27 05:20:19+00:00)
Title: virsh: Add ShellProcessTerminatedError in close_session.

When a VirshSession is already terminated when we call close_session(),
it will raise a ShellProcessTerminatedError. We should catch it and
notice that this session is already closed.

Signed-off-by: Dongsheng Yang