Create and push the following images:

• foo/test-private - make this private on the hub
• foo/test-public
• foo/private - make this private on the hub

Now, rmi all these images.

Try to build the following dockerfiles:

• FROM foo/test-private <- FAIL
• FROM foo/test-public <- WORKS
• FROM foo/private <- WORKS

Note that a simple docker pull foo/test-private works.

Reported initially by @sbasyal
cc @icecrime

ping @jlhawn @dmcgowan @stevvooe @RichardScothern