message: make block_test/sleepy_db co-exist and work with onblock message
diff: @@ -54,7 +54,8 @@ namespace eosio { namespace testing {
  }
  void base_tester::close() {
  - control.reset();
  + //temporary fix for sleepy_db/block_test. it seems like sleepy_db/block_test (or this functions) should better simulate disconnected node
  + //control.reset();
  chain_transactions.clear();
  }
  