selinux: add a 5 second sleep to /sys/fs/selinux/user

Commit d7b6918e22c7 ("selinux: Deprecate /sys/fs/selinux/user") started
the deprecation process for /sys/fs/selinux/user:

  The selinuxfs "user" node allows userspace to request a list
  of security contexts that can be reached for a given SELinux
  user from a given starting context. This was used by libselinux
  when various login-style programs requested contexts for
  users, but libselinux stopped using it in 2020.
  Kernel support will be removed no sooner than Dec 2025.

A pr_warn() message has been in place since Linux v6.13, this patch
adds a five second sleep to /sys/fs/selinux/user to help make the
deprecation and upcoming removal more noticeable.

Signed-off-by: Paul Moore <paul@paul-moore.com>

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