Enable voting by nova-volume devstack-gate.
Enable voting by nova-volume devstack-gate.

Change-Id: I82b9a810ee9cf0b7f5a45fa921661039ff6720f3
Reviewed-on: https://review.openstack.org/12088
Reviewed-by: Clark Boylan <635fc31d01fa593720982fa0568e87170cedbe2c@gmail.com>
Reviewed-by: John Griffith <09b4803c8a41cc8175d06916a7ee91aa990410f4@solidfire.com>
Approved: James E. Blair <e81a02a9d6405977f63a769d9f6ec8ed9d924325@inaugust.com>
Tested-by: Jenkins

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