Use dockerImageDestination.PutManifest in openshiftDestination.PutManifest
Use dockerImageDestination.PutManifest in openshiftDestination.PutManifest

Instead of manipulating an ImageStreamMapping and having to do exactly
what OpenShift does, just use the Docker Registry API and let the server
side deal with that.

This fixes “unexpected end of JSON input” when uploading schema2
manifests (because we didn’t also include the config object), and should
resolve https://github.com/projectatomic/skopeo/issues/208 (by using the
existing code on the server side)

Signed-off-by: Miloslav Trmač <9c008e38982a5397deb855345fb164f0558459ae@redhat.com>

masters-of-cats/image,containers/image,containers/image