Remove the lameo create_req hack and delay the addition of the HTTP_IN

Remove the lameo create_req hack and delay the addition of the HTTP_IN
filter until after we have read the headers.  This eliminates the status
hack that was in http_protocol.c and makes it all around better.

server/protocol.c now directly adds HTTP_IN filter - should we create a
specific hook for this?  (Could we do this as a post_read_request hook?)
I'm not terribly sure, but let's move it down to the lowest possible
place in ap_read_request.  We can change this detail later as we see fit.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@91192 13f79535-47bb-0310-9956-ffa450edef68