mod_proxy_http: put request/response splitting checks under the same comment.

mod_proxy_http: put request/response splitting checks under the same comment.

If stream_reqbody() detects a Content-Length vs bytes streamed mismatch it
means that a module's filter played bad games, such inconsistency on the client
connection would have been caught by ap_http_filter().

So move AH01087 logic to AH01086, under the same comment and log message, and
always return HTTP_INTERNAL_SERVER because the client is not the culprit here.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1878367 13f79535-47bb-0310-9956-ffa450edef68