Don't forget to shutdown server2

Author: Stephane Landelle

api/src/test/java/org/asynchttpclient/async/ProxyTunnellingTest.java

@@ -25,6 +25,7 @@
 import org.eclipse.jetty.server.handler.ProxyHandler;
 import org.eclipse.jetty.server.nio.SelectChannelConnector;
 import org.eclipse.jetty.server.ssl.SslSocketConnector;
+import org.testng.annotations.AfterClass;
 import org.testng.annotations.BeforeClass;
 import org.testng.annotations.Test;
 
@@ -87,6 +88,12 @@ public void setUpGlobal() throws Exception {
         server2.start();
         log.info("Local HTTP server started successfully");
     }
+    
+    @AfterClass(alwaysRun = true)
+    public void tearDownGlobal() throws Exception {
+        super.tearDownGlobal();
+        server2.stop();
+    }
 
     @Test(groups = { "online", "default_provider" })
     public void testRequestProxy() throws IOException, InterruptedException, ExecutionException, TimeoutException {