Changes

$ glance image-create --name centos7vzlinux-exe ct --disk-format ploop --min-ram 512 --min-disk 1 --container-format bare --property vm_mode=exe --property hypervisor_type=vz --property cinder_img_volume_type=vstorage-ploop --file centos7vzlinux7-exe.hds

$ glance image-create --name centos7vz7-hvm vm --disk-format qcow2 --min-ram 1024 --min-disk 10 --container-format bare --property cinder_img_volume_type=vstorage-qcow2 --file CentOS-7-x86_64-GenericCloud.qcow2 * CentOS image one can get here [http://cloud.centos.org/centos/7/images/CentOS-7-x86_64-GenericCloudvz7.qcow2 ]