mod_ldap, mod_authnzldap: Add support for nested groups (i.e. the ability

     to authorize an authenticated user via a "require ldap-group X" directive
     where the user is not in group X, but is in a subgroup contained in X.
     PR 42891 [Paul J. Reder]



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@560373 13f79535-47bb-0310-9956-ffa450edef68