Disable resp mode in echo servoce

[MahmoudRabee]

I Disabled the resp mode of echo service in config.toml file:resp_mode=false
then tested icapeg with this command : c-icap-client -i 127.0.0.1 -p 1344 -s echo -f "./in.pdf" -o ./out.pdf -v
the output was empty icap header
the output should be :
405 - Method not allowed for service (e.g., RESPMOD requested for service that supports only REQMOD).