Add DatabaseMetaDataPersistFacade.unregisterStorageUnits()

Author: terrymanu

mode/core/src/main/java/org/apache/shardingsphere/mode/metadata/persist/metadata/DatabaseMetaDataPersistFacade.java

@@ -129,7 +129,7 @@ public void renameSchema(final ShardingSphereMetaData metaData, final ShardingSp
 
     /**
      * Register storage units.
-     * 
+     *
      * @param databaseName database name
      * @param reloadMetaDataContexts reload meta data contexts
      */