[shim] (4 commits) ...Update how embedded cert and signing work.

[Peter Jones]

Summary of changes:

  189790d... Give this patch some git header magic. (*)
  2e38089... Add vendor cert-from-file magic (*)
  83155d7... Automatically embed the Red Hat Test Certificate and sign w (*)
  efdbd82... Update how embedded cert and signing work. (*)

(*) This commit already existed in another branch; no separate mail sent