ndb - hugo, fix closeTransaction in testPartitioning

ndb/test/include/UtilTransactions.hpp:
  Fix closeTransaction in testPartitioning
ndb/test/src/HugoOperations.cpp:
  Fix closeTransaction in testPartitioning
ndb/test/src/UtilTransactions.cpp:
  Fix closeTransaction in testPartitioning

ndb/test/include/UtilTransactions.hpp

@@ -28,6 +28,8 @@ public:
   UtilTransactions(Ndb* ndb, 
 		   const char * tableName, const char * indexName = 0);
   
+  int closeTransaction(Ndb*);
+  
   int clearTable(Ndb*, 
 		 int records = 0,
 		 int parallelism = 0);

ndb/test/src/HugoOperations.cpp

@@ -53,11 +53,7 @@ HugoOperations::setTransactionId(Uint64 id){
 
 int HugoOperations::closeTransaction(Ndb* pNdb){
 
-  if (pTrans != NULL){
-    pNdb->closeTransaction(pTrans);
-    pTrans = NULL;
-  }
-  pTrans = NULL;
+  UtilTransactions::closeTransaction(pNdb);
 
   m_result_sets.clear();
   m_executed_result_sets.clear();