Extclient NET-63x (#2286)

* model changes

* additional fields for extclient create

* add DNS to extclient config

* extclient name checks

* update extclient

* nmctl extclient

* final tweaks

* review comments

* add extclientdns to node on ingress creation

* fix to add ingress dns to api (#2296)

---------

Co-authored-by: Aceix <aceixsmartX@gmail.com>

functions/helpers_test.go

@@ -18,8 +18,7 @@ var (
 		NetID: "not-a-network",
 	}
 	testExternalClient = &models.ExtClient{
-		ClientID:    "testExtClient",
-		Description: "ext client for testing",
+		ClientID: "testExtClient",
 	}
 )