Drop client connections on response blocking

[krizhanovsky]

The issue is based on the comment #960 (review) : if tfw_http_resp_process() falls to bad_msg label, then the error/attack treatment is delegated to tfw_http_srv_error_resp_and_log(). If error responses are configured (reply parameter is true), them everything is fine. However, if we just block the response (reply is false), then current request and responses are just dropped and we continue to process next client requests. This way we break request-response sequence which we must not do.

If we block a response (as well as request), then we have to terminate client connection in respect to pipelined requests.