We are having an issue with the latest image of localstack (bc991b0bc3ce).
While creating an SQS and setting parameters we experience the following error:

```
localstack_1        | 2019-09-09T10:46:22:ERROR:localstack.services.generic_proxy: Error forwarding request: 'QueueUrl' Traceback (most recent call last):
localstack_1        |   File "/opt/code/localstack/localstack/services/generic_proxy.py", line 234, in forward
localstack_1        |     path=path, data=data, headers=forward_headers)
localstack_1        |   File "/opt/code/localstack/localstack/services/sqs/sqs_listener.py", line 53, in forward_request
localstack_1        |     self._set_queue_attributes(req_data)
localstack_1        |   File "/opt/code/localstack/localstack/services/sqs/sqs_listener.py", line 245, in _set_queue_attributes
localstack_1        |     queue_url = req_data['QueueUrl'][0]
localstack_1        | KeyError: 'QueueUrl'
```

From the logs I guess the `QueueUrl` is expected and it's not there. We don't see this behaviour in the last version (0.10.2).

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""" A context manager that captures stdout/stderr of the current thread. Use it as follows:
        with CaptureOutput() as c:
            ...
        print(c.stdout(), c.stderr())
    """
    orig_stdout = sys.stdout
    orig_stderr = sys.stderr
    orig___stdout = sys.__stdout__
    orig___stderr = sys.__stderr__
    CONTEXTS_BY_THREAD = {}
    class LogStreamIO(io.StringIO):
        def write(self, s):
            if isinstance(s, str) and hasattr(s, 'decode'):
                s = s.decode('unicode-escape')
            return super(CaptureOutput.LogStreamIO, self).write(s)
    def __init__(self):