Merge r1580568 from trunk:

mod_reqtimeout: Resolve unexpected timeouts on keepalive requests 
under the Event MPM. PR56216.  

Submitted By: Frank Meier <frank meier ergon ch>
Committed By: covener



Submitted by: covener
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1587697 13f79535-47bb-0310-9956-ffa450edef68