autotest/virt-test — pull request #982 by liyangfnst (2013-10-30 01:16:27+00:00)
Title: virt: Ignore exception detail if debug is False

For now, when use virsh.domain_exists() or vm.exists()
to check a guest, if it's not exist, there will be some
exception details printed in log, this may confuse users,
this will make them think there is an error happened.

Signed-off-by: Li Yang