saveShutdown methode

manager.js

@@ -66,6 +66,18 @@ const manager =  function(process){
       mayShutdown();
     });
   };
-
+  t.saveShutdown = function(){
+    return new Promise((res,rej)=>{
+      t.shutdown().then(()=>{
+        setTimeout(function() { //some save time
+          process.exit();
+        }, 1000);
+      }).catch(()=>{
+        setTimeout(function() { //shutdown on error with more save time
+          process.exit();
+        }, 10000);
+      });
+    });
+  }
 }
 export default manager;