Make table_{set,unset}() deal correctly with multiple occurrences of the

same key.
PR: 1604
Submitted by:	Stephen Scheck <sscheck@infonex.net>, Ben
Reviewed by:	Ben Laurie


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@79797 13f79535-47bb-0310-9956-ffa450edef68