BUG/MEDIUM: http-ana: Don't close request side when waiting for response

BUG/MEDIUM: http-ana: Don't close request side when waiting for response

A recent fix (af124360e "BUG/MEDIUM: http-ana: Detect closed SC on opposite side
during body forwarding") was pushed to handle to sync a side when the opposite
one is in closing state. However, sometimes, the synchro is performed too early,
preventing a L7 retry to be performed.

Indeed, while the above fix is valid on the reponse side. On the request side,
if the response was not yet received, we must wait before closing.

So, to fix the fix, on the request side, we at least wait the response was
received before finishing the request analysis. Of course, if there is an error,
an abort or anything wrong on the server side, the response analyser should
handle it.

This patch is related to #2061. No backport needed.