This will put some messages in the error log when some people try a lame

This will put some messages in the error log when some people try a lame
DoS by just opening a socket, and never sending any data.

Ivan suggested such a change about a month ago, to match the 1.3 behavoir.

Today I helped OSU's Admins figure out that someone was trying this 'attack'
against their mirror server.  The server status just showed hundreds of
Apache Children stuck in Reading.  This will at least hint to the admins
where the problem is by telling them about it in the error log.

Inspired by: Rici Lake, Ivan Ristic <ivanr webkreator.com>

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@105583 13f79535-47bb-0310-9956-ffa450edef68