Don't use a hardcoded cn=* in case the subgroup has no CN.

Submitted By: David Hawes <dhawes vt.edu>
Committed By: Eric Covener



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1528143 13f79535-47bb-0310-9956-ffa450edef68