Merge pull request #3055 from jglick/QueueTest.shouldBeAbleToBlockFlyweightTaskAtTheLastMinute

Try to avoid test hangs

test/src/test/java/hudson/model/QueueTest.java

@@ -862,6 +862,7 @@ public class QueueTest {
                     enteredTheQueue = true;
                 }
             }
+            Thread.sleep(10);
         }
         //let's wait for the upstream project to actually start so that we're sure the Queue has been updated
         //when the upstream starts the downstream has already left the buildable queue and the queue is empty