remove readConnectResponse as it's not there anymore
remove readConnectResponse as it's not there anymore

at some point of history ConnectHijack returned extra
http status to the client. It was removed but test was
not updated.

kofj/goproxy,elazarl/goproxy,elazarl/goproxy,kofj/goproxy,kofj/goproxy,elazarl/goproxy