Added logging error message for failed appraisal request.
Fixed typos
Sample output:
ERROR api_server::http::error] Attestation failed: Attestation request failed: response status=400 Bad Request, message=Invalid nonce and/or run time data provided in the request
Sample output:
ERROR api_server::http::error] Attestation failed: Attestation request failed: response status=400 Bad Request, message=Invalid nonce and/or run time data provided in the request