With a ca_cert_file specified in options, the nss_db was used before the
certificates from the file were added to it, which caused an exception
that led to fallback to ssh which is broken.
https://fedorahosted.org/freeipa/ticket/5965
Reviewed-By: Martin Basti <mbasti@redhat.com>
Reviewed-By: Jan Cholasta <jcholast@redhat.com>