Log OpenSSL errors on failure to set certificate

Log OpenSSL errors on failure to set certificate

Currently we log a bogus error message saying private key password
verification failed when SSL_CTX_use_cert_and_key() fails in
pkcs11_openssl.c. Instead print OpenSSL error queue and exit promptly.

Also log OpenSSL errors when SSL_CTX_use_certiifcate() fails in
cryptoapi.c and elsewhere. Such logging could be useful especially when
the ceritficate is rejected by OpenSSL due to stricter security
restrictions in recent versions of the library.

Change-Id: Ic7ec25ac0503a91d5869b8da966d0065f264af22
Signed-off-by: Selva Nair <selva.nair@gmail.com>
Acked-by: Arne Schwabe <arne@rfc2549.org>
Message-Id: <20231001174920.54154-1-selva.nair@gmail.com>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg27122.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>
(cherry picked from commit 2671dcb69837ae58b3303f11c1b6ba4cee8eea00)