labs: wait for cinder to start
labs: wait for cinder to start

If we don't wait for cinder to start before trying to create a test
volume, we risk getting error messages back.

Change-Id: I554e97498bcc2ecbbd65ff19b798f8109a275357
Implements: blueprint openstack-training-labs

harrisonfeng/training-guides,Nabs007/training-guides,openstack/training-guides,harrisonfeng/training-guides,harrisonfeng/training-guides,Nabs007/training-guides,Nabs007/training-guides,openstack/training-guides