Switch to emptyDir for /var/run shared by ovn-c containers

The directory carries unix socket, pid, ctl files but nothing that would
require persistence.

pkg/ovncontroller/volumes.go

@@ -26,10 +26,7 @@ func GetVolumes(name string, namespace string) []corev1.Volume {
 		{
 			Name: "var-run",
 			VolumeSource: corev1.VolumeSource{
-				HostPath: &corev1.HostPathVolumeSource{
-					Path: fmt.Sprintf("/var/home/core/%s/var/run/openvswitch", namespace),
-					Type: &directoryOrCreate,
-				},
+				EmptyDir: &corev1.EmptyDirVolumeSource{},
 			},
 		},
 		{