[pam/f15] (2 commits) ...fix pam_namespace leaking the protect mounts to parent namespace (#755216)

[Tomáš Mráz]

Summary of changes:

  3401bc3... add a note to limits.conf (#754285) (*)
  a49b27d... fix pam_namespace leaking the protect mounts to parent name (*)

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