Fixed Issue #4016 cannot set DNS servers in Client Template.

interface/web/client/form/client_template.tform.php

@@ -635,6 +635,23 @@ $form["tabs"]['limits'] = array (
 			'value'  => array(''),
 			'name'  => 'default_dnsserver'
 		),*/
+		'dns_servers' => array (
+			'datatype' => 'VARCHAR',
+			'formtype' => 'MULTIPLE',
+			'separator' => ',',
+			'default' => '1',
+			'datasource' => array (  'type' => 'CUSTOM',
+				'class'=> 'custom_datasource',
+				'function'=> 'client_servers'
+			),
+			'validators'    => array (  0 => array ( 'type' => 'CUSTOM',
+					'class' => 'validate_client',
+					'function' => 'check_used_servers',
+					'errmsg'=> 'dns_servers_used'),
+			),
+			'value'  => '',
+			'name'  => 'dns_servers'
+		),
 		'limit_dns_zone' => array (
 			'datatype' => 'INTEGER',
 			'formtype' => 'TEXT',