SSLServer::update_certs_pem() loaded the client CA it was given but
left client certificate verification as it was, so on a server built
without a client CA it returned true while clients without a
certificate still got in. Turn verification on, as the constructors do
when they are given a client CA. A client CA passed to
update_certs_pem() now always makes client certificates required.
yhirose
98647e059d
