Add tls server example

[DemesneGH]

The tls_server-rs example sets up the TLS server in TA. Same as the tls_client-rs example, it also needs the larger TA heap buffer. So in the CI process, it uses QEMU images which expand the TA memory.

Updates:

• Add examples/tls_server-rs/
• Add tests/test_tls_server.sh
• Update tests/optee-qemuv8.sh for forwarding the host port 54433 to the guest port 4433
• Ignore keys and certs in the license checking process

[DemesneGH]

@mssun There are more keys and certs in tls_server-rs/ta/test-ca which are generated in multiple algorithms (ecdsa, eddsa, and rsa). But the tls server example only loads ecdsa keys. Should we remove the build-a-pki.sh script and the other keys? Or just reserve them in the directory?

[mssun]

@mssun There are more keys and certs in tls_server-rs/ta/test-ca which are generated in multiple algorithms (ecdsa, eddsa, and rsa). But the tls server example only loads ecdsa keys. Should we remove the build-a-pki.sh script and the other keys? Or just reserve them in the directory?

I think we can remove the script and leave the test certificates only.

[DemesneGH]

I think we can remove the script and leave the test certificates only.

OK. The script build-a-pki.sh and the related config file openssl.cnf have been removed.