HTTP banner is not being utilized

[laser-bear]

The HTTP service returns (e.g., with curl -I) Server: BaseHTTP/0.6 Python/3.7.11 instead of the provided banner from the configuration file.

This problem originates from:

• The banner is not read correctly from the configuration file
• The banner is not utilized inside the HTTP service (do_HEAD and do_AUTHHEAD functions)
• Service returns the "sys_version" string Python/3.7.11

I have modified my local Heralding HTTP service to address all of the above. If desired I can create a pull request to integrate the code (few code lines in the HTTP service).