Add nova-volume devstack gate as non-voting check.
Add nova-volume devstack gate as non-voting check.

To make sure it still builds.

Change-Id: I4acb594ec52f421e6c0298517d42bee19c956f38
Reviewed-on: https://review.openstack.org/12087
Approved: James E. Blair <e81a02a9d6405977f63a769d9f6ec8ed9d924325@inaugust.com>
Reviewed-by: James E. Blair <e81a02a9d6405977f63a769d9f6ec8ed9d924325@inaugust.com>
Tested-by: Jenkins

anbangr/osci-project-config,coolsvap/project-config,open-switch/infra_project-config,dongwenjuan/project-config,coolsvap/project-config,Tesora/tesora-project-config,osrg/project-config,openstack-infra/project-config,Tesora/tesora-project-config,noorul/os-project-config,dongwenjuan/project-config,openstack-infra/project-config,citrix-openstack/project-config,osrg/project-config,anbangr/osci-project-config,noorul/os-project-config,open-switch/infra_project-config,citrix-openstack/project-config