Simplify regex for identifying order number in DN (#7646) (#7697)

Assume that if a string of digits occurs between curly braces anywhere
in the first component of the DN, that this is an order number. The
sequence does not necessarily have to occur after an equals sign.

plugins/module_utils/ldap.py

@@ -139,5 +139,7 @@ class LdapGeneric(object):
 
     def _xorder_dn(self):
         # match X_ORDERed DNs
-        regex = r"\w+=\{\d+\}.+"
-        return re.match(regex, self.module.params['dn']) is not None
+        regex = r".+\{\d+\}.+"
+        explode_dn = ldap.dn.explode_dn(self.module.params['dn'])
+
+        return re.match(regex, explode_dn[0]) is not None