Previously it is expanded to a whitespace separated list which is not
the most appropriate format. Since it's only two items, flatten it.
Signed-off-by: NFam Zheng <famz@redhat.com>
Message-Id: <1474429768-25027-6-git-send-email-famz@redhat.com>
Reviewed-by: NDaniel P. Berrange <berrange@redhat.com>