After cloning the repo and running: `docker build -t localstack:latest .`
I can see the following errors:

```
Starting mock Lambda service (http port 4574)...
ERROR: Error forwarding request: HTTPConnectionPool(host='127.0.0.1', port=4564): Max retries exceeded with url: / (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7f4c7b4e7c10>: Failed to establish a new connection: [Errno 111] Connection refused',)) Traceback (most recent call last):
  File "/opt/code/localstack/localstack/services/generic_proxy.py", line 216, in forward
    headers=forward_headers, stream=True)
  File "/opt/code/localstack/.venv/lib/python2.7/site-packages/requests/api.py", line 116, in post
    return request('post', url, data=data, json=json, **kwargs)
  File "/opt/code/localstack/.venv/lib/python2.7/site-packages/requests/api.py", line 60, in request
    return session.request(method=method, url=url, **kwargs)
  File "/opt/code/localstack/.venv/lib/python2.7/site-packages/requests/sessions.py", line 524, in request
    resp = self.send(prep, **send_kwargs)
  File "/opt/code/localstack/.venv/lib/python2.7/site-packages/requests/sessions.py", line 637, in send
    r = adapter.send(request, **kwargs)
  File "/opt/code/localstack/.venv/lib/python2.7/site-packages/requests/adapters.py", line 516, in send
    raise ConnectionError(e, request=request)
ConnectionError: HTTPConnectionPool(host='127.0.0.1', port=4564): Max retries exceeded with url: / (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7f4c7b4e7c10>: Failed to establish a new connection: [Errno 111] Connection refused',))
```

I see the same thing when running `localstack start --docker` which is what I originally tried as I would like to use localstack for development purposes in an existing stack.

MacOS Mojave 10.14
Docker for Mac: 18.06.1-ce-mac73 (26764)
LOGGER = logging.getLogger(__name__)
def test_firehose_s3():
    s3_resource = aws_stack.connect_to_resource('s3')
    firehose = aws_stack.connect_to_service('firehose')
    s3_prefix = '/testdata'
    test_data = '{"test": "firehose_data_%s"}' % short_uid()
    
    stream = firehose.create_delivery_stream(
        DeliveryStreamName=TEST_FIREHOSE_NAME,
        S3DestinationConfiguration={
            'RoleARN': aws_stack.iam_resource_arn('firehose'),
            'BucketARN': aws_stack.s3_bucket_arn(TEST_BUCKET_NAME),
            'Prefix': s3_prefix
        }
    )
    assert stream
    assert TEST_FIREHOSE_NAME in firehose.list_delivery_streams()['DeliveryStreamNames']
    
    s3_resource.create_bucket(Bucket=TEST_BUCKET_NAME)
    
    firehose.put_record(
        DeliveryStreamName=TEST_FIREHOSE_NAME,
        Record={
            'Data': to_bytes(test_data)
        }
    )
    
    all_objects = testutil.list_all_s3_objects()
    testutil.assert_objects(json.loads(to_str(test_data)), all_objects)
def test_firehose_kinesis_to_s3():