MINOR: http-act: Add 'no-fail' option on 'wait-for-body' action

MINOR: http-act: Add 'no-fail' option on 'wait-for-body' action

With this option, the "wait-for-body" action does not return an error at the
end of the timeout but continues the message analysis with the body received
so far, instead of responding with a 408 "Request Timeout" error to the
client on the request side or a 504 "Gateway Timeout" error on the response
side. The remaining body bytes, if any, are streamed to the server or to the
client once received.