httpRelayServer: restore POST body handling and add HTTPS/TLS support

[Coontzy1]

httpRelayServer: restore POST body handling and add HTTPS/TLS support
This commit makes two improvements to httprelayserver.py:

1. Restore POST body draining logic (httpRelayServer: read body content for POST requests #913):

   • Re-applies fix originally merged in 2021 by Rcarnus.
   • Ensures POST request bodies are consumed before returning 401 Unauthorized.
   • Fixes WSUS and other web clients that retry authentication on the same TCP stream.

2. Add HTTPS/TLS support with improved logging:

   • Introduce optional SSL context when --https, --certfile, and --keyfile are provided.
   • Wrap inbound sockets with TLS, logging negotiated protocol/cipher on success.
   • On failures, log SSL error details, flagging early EOFs (likely client cert rejection).
   • Add startup banner showing port, IPv6/HTTPS status for clarity.

Together these changes allow ntlmrelayx to:

• Correctly handle WSUS POST-based authentication flows.
• Relay over HTTPS endpoints (e.g., WSUS 8531) with real certs or self-signed.
• Provide more useful debug information for operators.

[anadrianmanrique]

Hi @Coontzy1, is there any reason to close this one?

[Coontzy1]

Hi @anadrianmanrique, I closed this by mistake. I wasn't able to reopen, so I reopened it as #2053.

[anadrianmanrique]

NP, thanks for reopening