add sslscan proxy feature to test EAP-TLS over IKEv2

[michael-dev]

This pull request adds

• support for testing IKEv2 without actually configuring the kernel
• parsing CERT, CERTREQ und EAP payloads
• tunneling EAP-TLS to any TLS-Client, e.g. for sslscan
• more DH transforms
• ability to disable peer ID checking or using certificate fingerprinting instead of providing the public key
• handle SHA-1 PayloadAUTH signatures
• more flexibility in specifying the peer id

[alejandro-perez]

Hi @michael-dev. I'm not actively workig on this project, but I'm curious about how you are using it. Is it educational?