[CP] BUG FIX: make create partition group process rollback success if it is failed.

src/storage/ob_partition_group.cpp

@@ -107,6 +107,7 @@ ObPartitionGroup::ObPartitionGroup()
 
 ObPartitionGroup::~ObPartitionGroup()
 {
+  FLOG_INFO("deconstruct ObPartitionGroup", K(this), K_(pkey));
   destroy();
 }