Vendor in latest containers/image and containers/storage

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

Closes: #869
Approved by: rhatdan

image.go

@@ -143,7 +143,7 @@ func (i *containerImageRef) extractRootfs() (io.ReadCloser, error) {
 		if err != nil {
 			err = errors.Wrapf(err, "error closing tar archive of container %q", i.containerID)
 		}
-		if err2 := i.store.Unmount(i.containerID); err == nil {
+		if _, err2 := i.store.Unmount(i.containerID, false); err == nil {
 			if err2 != nil {
 				err2 = errors.Wrapf(err2, "error unmounting container %q", i.containerID)
 			}

unmount.go

@@ -2,7 +2,7 @@ package buildah
 
 // Unmount unmounts a build container.
 func (b *Builder) Unmount() error {
-	err := b.store.Unmount(b.ContainerID)
+	_, err := b.store.Unmount(b.ContainerID, false)
 	if err == nil {
 		b.MountPoint = ""
 		err = b.Save()

vendor.conf

@@ -5,7 +5,7 @@ github.com/containerd/continuity master
 github.com/containernetworking/cni v0.6.0
 github.com/seccomp/containers-golang master
 github.com/containers/image master
-github.com/containers/storage 9cbb6cb3fc2044eae8b8fd8d8da081fe812858c4
+github.com/containers/storage 8b1a0f8d6863cf05709af333b8997a437652ec4c
 github.com/docker/distribution 5f6282db7d65e6d72ad7c2cc66310724a57be716
 github.com/docker/docker b8571fd81c7d2223c9ecbf799c693e3ef1daaea9
 github.com/docker/docker-credential-helpers d68f9aeca33f5fd3f08eeae5e9d175edf4e731d1
@@ -51,6 +51,7 @@ github.com/vbatts/tar-split v0.10.2
 github.com/xeipuuv/gojsonpointer master
 github.com/xeipuuv/gojsonreference master
 github.com/xeipuuv/gojsonschema master
+github.com/ulikunitz/xz v0.5.4
 golang.org/x/crypto master
 golang.org/x/net master
 golang.org/x/sys master