JERSEY-2291: Un-ignored shutdown hook leak test which serves as a good evidence whether enabled immediate scope services do not mess up the client.

When immediate scope services are enabled, this test creates new thread for each iteration, which is probably something we don't like.

Change-Id: I3874e5ce0e5e813c36d2c0a45cf066a19223b498

Author: stepanv

core-client/src/test/java/org/glassfish/jersey/client/ShutdownHookLeakTest.java

@@ -39,7 +39,6 @@
  */
 package org.glassfish.jersey.client;
 
-
 import java.lang.ref.WeakReference;
 import java.lang.reflect.Field;
 import java.util.Collection;
@@ -48,13 +47,11 @@
 import javax.ws.rs.client.ClientBuilder;
 import javax.ws.rs.client.WebTarget;
 
+import org.junit.Test;
 import static org.hamcrest.CoreMatchers.is;
 import static org.hamcrest.number.OrderingComparison.lessThan;
 import static org.junit.Assert.assertThat;
 
-import org.junit.Ignore;
-import org.junit.Test;
-
 /**
  * Reproducer for JERSEY-2786.
  *
@@ -67,7 +64,6 @@ public class ShutdownHookLeakTest {
 
     @SuppressWarnings("unchecked")
     @Test
-    @Ignore("intermittent failures.")
     public void testShutdownHookDoesNotLeak() throws Exception {
         final Client client = ClientBuilder.newClient();
         final WebTarget target = client.target("http://example.com");