iPXE TLS requiring trusting the intermediate certificate

[CMCDragonkai]

Using wireshark shows that the difference between using `openssl s_client` and iPXE. The iPXE is not sending the entire client certificate chain (unlike openssl which builds a "client certificate chain"), it is sending just the very first certificate in the pem file put into `CERT=client-chain.pem`). This of course fails, because the server side requires verifying the client certificate against the root certificate.

I'm now testing with the server side putting the intermediate certificate in the trusted store and seeing what happens.