Re: [PATCH] Pipeline prefetch build-time control

So be it. This drops connOkToAddrequest() in favour of a
ConnStateData::concurrentRequestQueueFilled() which simply checks the
available queue space and replies true/false. All other state handling
relies on the existing code to behave properly. Pity anyone who hits a bug.

I've left in the parsing check we agreed on earlier.

Amos