Updated openstack/openstack
Project: openstack-dev/devstack  613fd5591c8d6cfac6ccf4b197ed93bb8d2f7676
null
Remove docker exercise

No other hypervisor has a dedicated exercise, docker should be
tested just by testing the nova APIs, not on it's own.

Change-Id: Ifc788815380e8502449171410dea8260786a1e79