Updated openstack/openstack
Project: openstack-dev/devstack  527f21c7e79cee86c6ce6c6bc8a52d819c3dcd19

Only use heat image where support

Glance will reject images that it doesn't understand, and only certain drivers can
use qcow2 images.  This means for systems without qcow2 support, devstack
will fail to run until this change is merged.

Change-Id: Ic92815f3d32880e987456c0428953dddaa81c94c