Allow mod_lua to supply a database result with named rows instead of only numeric indexes.

git-svn-id: http://svn.apache.org/repos/asf/httpd/httpd/trunk@1570528 13f79535-47bb-0310-9956-ffa450edef68
backported in r1570530

git-svn-id: http://svn.apache.org/repos/asf/httpd/httpd/trunk@1570531 13f79535-47bb-0310-9956-ffa450edef68