Fix helper reply length detection

Fix helper reply length detection

Stateless helper reply handler was incrementing 't' position before
passing the details of response length to HelperReply parser.

Stateful helper reply handler was pointing at position of \n insteaf of
position of \r when \r\n received.

Both of these cause the response length parameter sent to the reply
parser to be longer than the actual response characters length. Breaking
parse on responses with just result code followed by \n since the string
comparison EOL is now tested against input length 2/3/4.