Merge pull request #124 from hashicorp/f-docker-cleanup-config

Add all containers when searching for images that are still in used, since the container using the image may be stopped

client/driver/docker.go

@@ -344,6 +344,7 @@ func (h *dockerHandle) Kill() error {
 	err = h.client.RemoveImage(h.imageID)
 	if err != nil {
 		containers, err := h.client.ListContainers(docker.ListContainersOptions{
+			All: true,
 			Filters: map[string][]string{
 				"image": []string{h.imageID},
 			},