private void addTableInput() {
    ReadEntity re = new ReadEntity(newTable(false));
    readEntities.add(re);
  }
Same as testHeartbeater, but testing cleanup of replication txns (TxnType.REPL_CREATED)
Note: in TestDbTxnManager metastore.repl.txn.timeout is set to 30s for testing purposes.
ql/src/test/org/apache/hadoop/hive/ql/lockmgr/TestDbTxnManager.java