MEDIUM: http-ana: handle read error on server side if waiting for response

MEDIUM: http-ana: handle read error on server side if waiting for response

A read error on the server side is also reported as a write error on the
client side. It means some times, a server side error is handled on the
client side. Among others, it is the case when the client side is waiting
for the response while the request processing is already finished. In this
case, the error is not handled as a server error. It is not accurate.

So now, when the request processing is finished but not the response
processing and if a read error was encountered on the server side, the error
is not immediatly processed on the client side, to let a chance to response
analysers to properly catch the error.