#8 wrap Shell in a dedicated Thread

src/main/java/dslab/nameserver/Nameserver.java

@@ -26,6 +26,7 @@ public class Nameserver implements INameserver {
     private NameServerRemote nameServerLocal;
 
     private Shell shell;
+    private Thread shellThread;
 
     /**
      * Creates a new server instance.
@@ -80,11 +81,12 @@ public class Nameserver implements INameserver {
                     this.shutdown();
                     throw new StopShellException();
                 })));
+        shellThread = new Thread(shell);
     }
 
     @Override
     public void run() {
-        shell.run();
+        shellThread.start();
     }
 
     @Override