Comment 3 for bug 1534026

Got it again here: http://logs.openstack.org/06/279406/19/gate/gate-heat-dsvm-functional-orig-mysql-lbaasv2/774b57b/

We get a new clearer error now though: Image a494b0a9-b49a-4b41-bc7c-ed10e15e898e is unacceptable: Unable to convert image to raw.