Ensure keep-alive is not used in http_response input.
Ensure keep-alive is not used in http_response input.

Using Keep-Alive would change the timing for already established
connections.  Previous to this commit, Keep-Alive worked only when using
a response_string_match due to failure to close the request body.

jeichorn/telegraf,jeichorn/telegraf,jeichorn/telegraf,jeichorn/telegraf