[krb5/f20] (4 commits) ...Finish fixing the don't-call-NULL-prompters bug

[Nalin Dahyabhai]

Summary of changes:

  52b6b40... - rebuild with keyutils 1.5.8 (part of #1012043) (*)
  37f8b28... fix trigger's invocation of sed (#1016945) (*)
  8220592... Use the prompter callback for PEM files (*)
  84fe7d6... Finish fixing the don't-call-NULL-prompters bug (*)

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