CVE-2014-0098 (reported by Rainer Canavan <rainer-apache 7val com>)

Segfaults w/ truncated cookie logging.

Clean up the cookie logging parser to recognize only the cookie=value pairs,
not valueless cookies.  This refactors multiple passes over the same string
buffer into a single pass parser.

Submitted by: wrowe
Reviewed by: rpluem, jim 



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1575400 13f79535-47bb-0310-9956-ffa450edef68