added ldap_dn to oauth2 userinfo

uffd/oauth2/views.py

@@ -102,6 +102,7 @@ def userinfo():
 		name=user.displayname,
 		nickname=user.loginname,
 		email=user.mail,
+		ldap_dn=user.dn,
 		groups=[group.name for group in user.get_groups()]
 	)