Added ppc64le ensure image to the Dockerfile

Adds ppc64le image to the Dockerfile,
should be with 03fc212b6d6c2b3ecff42f33b7b3a7181043b09e

Signed-off-by: Christopher Jones <tophj@linux.vnet.ibm.com>

Dockerfile.ppc64le

@@ -81,7 +81,8 @@ ENV IMAGEREPO ppc64le
 COPY contrib/download-frozen-image-v2.sh /go/src/github.com/docker/docker/contrib/
 RUN ./contrib/download-frozen-image-v2.sh /docker-frozen-images \
 	$IMAGEREPO/busybox:latest \
-	$IMAGEREPO/hello-world:frozen 
+	$IMAGEREPO/hello-world:frozen \ 
+	$IMAGEREPO/unshare:latest	
 
 # Wrap all commands in the "docker-in-docker" script to allow nested containers
 ENTRYPOINT ["hack/dind"]