Fix missing print format error
Fix missing print format error

Missing print format will cause 'ValueError: unsupported
format character' error, this is to fix it.

Change-Id: I6ee192a95d86209d041a4675935fc1643483571f

j-griffith/cinder,mahak/cinder,phenoxim/cinder,mahak/cinder,openstack/cinder,phenoxim/cinder,j-griffith/cinder,openstack/cinder