Fix for uninitialized TransactionManager in PartitionedDatabase

Reference: ONOS-2157

Change-Id: Idec1c2242dd53a31836c69339ba89988a19556bb

@@ -232,6 +232,7 @@ public class DatabaseManager implements StorageService, StorageAdminService {
         Futures.getUnchecked(status);
 
         transactionManager = new TransactionManager(partitionedDatabase, consistentMapBuilder());
+        partitionedDatabase.setTransactionManager(transactionManager);
 
         eventDispatcher = Executors.newSingleThreadExecutor(
                 groupedThreads("onos/store/manager", "map-event-dispatcher"));

@@ -418,7 +418,7 @@ public class PartitionedDatabase implements Database {
         return subTransactions;
     }
 
-    protected void setTransactionManager(TransactionManager tranasactionManager) {
+    protected void setTransactionManager(TransactionManager transactionManager) {
         this.transactionManager = transactionManager;
     }
 }