better tearDown: allows setup and tear down to be call multiple times in a single testcase.

git-svn-id: https://svn.apache.org/repos/asf/incubator/activemq/trunk@360315 13f79535-47bb-0310-9956-ffa450edef68

activemq-core/src/test/java/org/apache/activemq/JmsMultipleClientsTestSupport.java

@@ -217,6 +217,8 @@ public class JmsMultipleClientsTestSupport extends CombinationTestSupport {
             }
         }
         broker.stop();
+        allMessagesList.flushMessages();
+        consumers.clear();
         super.tearDown();
     }