I have a small doubt, what is the proper format of a `command`?:

```
    def execute_work(self, key, command):
        """
        Executes command received and stores result state in queue.
        :param key: the key to identify the TI
        :type key: Tuple(dag_id, task_id, execution_date)
        :param command: the command to execute
        :type command: string
        """
```
because looking at the code seems should be a string...but looks like a small 
lie, because tests were passing a`list` (this is why I added the `isinstance` 
check).

[ Full content available at: 
https://github.com/apache/incubator-airflow/pull/3799 ]
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