public void start() throws Exception {
    warehouse = new Warehouse(configuration);
    warehouseRootFs = warehouse.getFs(warehouse.getWhRoot());
    TrashPolicy trashPolicy = TrashPolicy.getInstance(configuration, warehouseRootFs);
    trashDir = trashPolicy.getCurrentTrashDir();
  }
Starts the MetaStoreService. Be aware, as the current MetaStore does not implement clean
shutdown, starting MetaStoreService is possible only once per test.

@throws Exception if any Exception occurs
standalone-metastore/metastore-server/src/test/java/org/apache/hadoop/hive/metastore/minihms/AbstractMetaStoreService.java