always use the Cookie header to read a cookie

PR: 11475
Submitted by: Chris Darrochi <chrisd pearsoncmg.com>
Reviewed by: Jeff Trawick, Joe Orton


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/APACHE_2_0_BRANCH@102451 13f79535-47bb-0310-9956-ffa450edef68