merge from trunk and 2.2.x, using existing published patch for 2.0.63:

  *) SECURITY: CVE-2008-2364 (cve.mitre.org)
     mod_proxy_http: Better handling of excessive interim responses
     from origin server to prevent potential denial of service and high
     memory usage. Reported by Ryujiro Shibuya. [Ruediger Pluem,
     Joe Orton, Jim Jagielski]

Reviewed by: trawick, wrowe, rpluem



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.0.x@921908 13f79535-47bb-0310-9956-ffa450edef68