<!-- Love localstack? Please consider supporting our collective:
👉  https://opencollective.com/localstack/donate -->

# Type of request: This is a ...

[x] bug report
[ ] feature request

# Detailed description
When `mountCode: true` for a serverless.yml deployment to localstack on Windows, Localstack mounts the wrong path.
...

## Expected behavior
Docker expects the Windows client path value of the `-v` flag to begin with `/host_mtn/`.
...

## Actual behavior
Localstack does not add this to the Windows client path. This causes the volume sharing to fail. Once one tries to invoke a lambda without the proper volume sharing, the lambda fails with an error along the lines of "can't find no module 'lambda_name'".
...

# Steps to reproduce
1. In your `serverless.yml` set `mountCode: true` 
2. In your `docker-compose.yml` set the environment variable `LAMBDA_REMOTE_DOCKER: "0"` for the localstack container
3. Deploy some test lambda to the localstack container
4. Attempt to invoke with `awslocal lambda invoke --function-name LAMBDA_NAME out.txt` and replace LAMBDA_NAME with the name of your test lambda.
5. Note the invocation failure.

## Command used to start LocalStack
Started via a `docker-compose.yml` file. Pretty basic stuff.
...

## Client code (AWS SDK code snippet, or sequence of "awslocal" commands)
Just the `awslocal` invoke command outlined above.
...

pass
    def cleanup(self, arn=None):
        pass
    def run_lambda_executor(self, cmd, event=None, func_details=None, env_vars={}):
        process = run(cmd, asynchronous=True, stderr=subprocess.PIPE, outfile=subprocess.PIPE,
                      env_vars=env_vars, stdin=True)
        result, log_output = process.communicate(input=event)
        try:
            result = to_str(result).strip()
        except Exception:
            pass
        log_output = to_str(log_output).strip()
        return_code = process.returncode
        
        
        
        if isinstance(result, six.string_types) and '\n' in result:
            additional_logs, _, result = result.rpartition('\n')
            log_output += '\n%s' % additional_logs
        log_formatted = log_output.strip().replace('\n', '\n> ')
        func_arn = func_details and func_details.arn()
        LOG.debug('Lambda %s result / log output:\n%s\n> %s' % (func_arn, result.strip(), log_formatted))
        
        _store_logs(func_details, log_output)
        if return_code != 0:
            raise Exception('Lambda process returned error status code: %s. Result: %s. Output:\n%s' %
                (return_code, result, log_output))
        return result
class ContainerInfo: