GnuTLS seems to require the intermediate CA certificate to be included
both in the ca_cert and client_cert file for the cases of server and
client certificates using different intermediate CA certificates. Use
the user_and_ica.pem file with GnuTLS builds and reorder the
certificates in that file to make this work with GnuTLS.
Signed-off-by: Jouni Malinen <j@w1.fi>