Manage cinder-volume service with pacemaker

Unlike other Cinder services, the openstack-cinder-volume service was
not managed by Pacemaker. This is now fixed.
Merge pull request #211 from jistr/cinder_volume_pacemaker

Manage cinder-volume service with pacemaker
compute: add selinux virt_use_nfs cinder nfs boolean
Merge pull request #212 from cwolferh/compute_node_add_nfs_cinder_bool

compute: add selinux virt_use_nfs cinder nfs boolean