Added a test to check the cleaning of server status in start/sop cycles (usually used in integration tests itself.

broker/src/main/java/org/dna/mqtt/moquette/messaging/spi/impl/subscriptions/SubscriptionsStore.java

@@ -70,11 +70,17 @@ public class SubscriptionsStore {
         m_storageService = storageService;
 
         //reload any subscriptions persisted
+        if (LOG.isDebugEnabled()) {
+            LOG.debug("subscription tree before {}", dumpTree());
+        }
         LOG.debug("Reloading all stored subscriptions...");
         for (Subscription subscription : m_storageService.retrieveAllSubscriptions()) {
             LOG.debug("Re-subscribing {} to topic {}", subscription.getClientId(), subscription.getTopic());
             addDirect(subscription);
         }
+        if (LOG.isDebugEnabled()) {
+            LOG.debug("subscription tree after {}", dumpTree());
+        }
         LOG.debug("Finished loading");
     }