Enhancing human readable helper script + comments

- Enhancing the human readable script to handle signed CBOR and display
  all fields in human readable form.
- Addressing fix from Rob

Signed-off-by: Alex Tzonkov <4975715+attzonko@users.noreply.github.com>

Author: attzonko

shortform_report-main/OcpReportLib.py

@@ -510,7 +510,7 @@ def get_signed_json_report(self) -> bytes:
         """Returns the signed short form report (a JWS) as a bytes object. May
         return a 'None' object if the report hasn't been signed yet.
         """
-        return self.signed_json_report
+        return self.signed_json_report.encode('utf-8')
 
     def sign_json_report_pem(self, priv_key: bytes, algo: str, kid: str) -> bool:
         """Sign the JSON object to make a JSON Web Signature. Refer to RFC7515