APPS load_key_certs_crls(): Make file access errors much more readable

This reverts part of commit ef044913 using a less invasive suppression.

Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/16452

)

(cherry picked from commit 6e249947)
Reviewed-by: Hugo Landau <hlandau@openssl.org>