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)
if not self.check_function:
            return
        return self.check_function(expect_shutdown=expect_shutdown, print_error=print_error)
    def name(self):
        return self.plugin_name
def register_plugin(plugin):
    SERVICE_PLUGINS[plugin.name()] = plugin
def load_plugin_from_path(file_path, scope=None):
    if os.path.exists(file_path):
        module = re.sub(r'(^|.+/)([^/]+)/plugins.py', r'\2', file_path)
        method_name = 'register_localstack_plugins'
        scope = scope or PLUGIN_SCOPE_SERVICES
        if scope == PLUGIN_SCOPE_COMMANDS:
            method_name = 'register_localstack_commands'
        try:
            namespace = {}
            exec('from %s.plugins import %s' % (module, method_name), namespace)
            method_to_execute = namespace[method_name]
        except Exception:
            return
        try:
            return method_to_execute()
        except Exception as e:
            LOGGER.warning('Unable to load plugins from file %s: %s' % (file_path, e))
def load_plugins(scope=None):