Merge r1542549 from 2.4.x:

Potential rejection of valid MaxMemFree and ThreadStackSize directives

trunk patch: https://svn.apache.org/r1542338

Submitted by: Mike Rumph <mike.rumph oracle.com>
Reviewed by: trawick, covener, sf



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@1777401 13f79535-47bb-0310-9956-ffa450edef68