Drop severity from DEBUG to trace4: "... didn't match with attr DN failed group verification."

(This is just mod_authnz_ldap trying multiple atribbutes to discover LDAP subgroups)


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1496183 13f79535-47bb-0310-9956-ffa450edef68