Update OHTablePool.java (#35)

need use PooledOHTable in our cases

Author: miao724

src/main/java/com/alipay/oceanbase/hbase/OHTablePool.java

@@ -657,7 +657,7 @@ public ExecutorService getRuntimeBatchExecutor(String tableName) {
      * A proxy class that implements HTableInterface.close method to return the
      * wrapped table back to the table pool
      */
-    class PooledOHTable implements HTableInterface {
+    public class PooledOHTable implements HTableInterface {
 
         private HTableInterface table; // actual table implementation