Get rid of tenant DB manager connection config

src/Exceptions/ModelNotSyncMasterException.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace Stancl\Tenancy\Exceptions;
+
+use Exception;
+
+class ModelNotSyncMasterException extends Exception
+{
+    public function __construct(string $class)
+    {
+        parent::__construct("Model of $class class is not an SyncMaster model. Make sure you're using the central model to make changes to synced resouces when you're in the central context");
+    }
+}