Add wait time to offset thread handling within JUnit

Author: cogmission

src/test/java/org/numenta/nupic/network/NetworkTest.java

@@ -450,7 +450,11 @@ public void onNext(Inference inf) {
         });
 
         network.halt();
-        try { network.lookup("r1").lookup("1").getLayerThread().join(3000); }catch(Exception e) { e.printStackTrace(); }
+        try { 
+            network.lookup("r1").lookup("1").getLayerThread().join(3000);
+            // Add a little more wait time
+            Thread.sleep(3000);
+        }catch(Exception e) { e.printStackTrace(); }
         network.restart();
 
         Publisher newPub = network.getPublisher();