Remark: this might be the same issue as: https://github.com/localstack/localstack/issues/1055

There is some kind of error that is occurring when trying to run a lambda function using the invoke command from the javascript SDK. Not sure if I'm doing anything wrong. please advise. This works with a live lambda function.

Call from AWS SDK (Javascript)
```
const { source, identifier } = ctx.params;

const bodyBuffer = await requestToBuffer(ctx.request.req);
const bodyBase64 = bodyBuffer.toString('base64');

const payload = {
        pathParameters: {
            source,
            identifier,
        },
        isBase64Encoded: true,
        body: bodyBase64,
    };
const response = await lambda.invoke({
        FunctionName: 'arn:aws:lambda:us-east-1:000000000000:function:uploadAvatar',
        InvocationType: 'RequestResponse',
        Payload: JSON.stringify(payload),
    }).promise();
```

**Note**: I also tried just using uploadAvatar for the function name.

Error Stack Trace returned by Localstack

```
InternalFailure: Error executing Lambda function: [Errno 7] Argument list too long Traceback (most recent call last):
    File "/opt/code/localstack/localstack/services/awslambda/lambda_api.py", line 301, in run_lambda
      event, context=context, version=version, asynchronous=asynchronous)
    File "/opt/code/localstack/localstack/services/awslambda/lambda_executors.py", line 136, in execute
      result, log_output = self.run_lambda_executor(cmd, environment, asynchronous)
    File "/opt/code/localstack/localstack/services/awslambda/lambda_executors.py", line 58, in run_lambda_executor
      process = run(cmd, asynchronous=True, stderr=subprocess.PIPE, outfile=subprocess.PIPE, env_vars=env_vars)
    File "/opt/code/localstack/localstack/utils/common.py", line 666, in run
      return do_run(cmd)
    File "/opt/code/localstack/localstack/utils/common.py", line 656, in do_run
      stderr=stderr, stdout=stdout_arg, env=env_dict, cwd=cwd)
    File "/opt/code/localstack/.venv/lib/python2.7/site-packages/subprocess32.py", line 825, in __init__
      restore_signals, start_new_session)
    File "/opt/code/localstack/.venv/lib/python2.7/site-packages/subprocess32.py", line 1574, in _execute_child
      raise child_exception_type(errno_num, err_msg)
  OSError: [Errno 7] Argument list too long
```

Localstack configuration environment variables:
```
SERVICES=lambda,sns,s3,ses,cloudformation,cloudwatch,apigateway
DEFAULT_REGION=us-east-1
HOSTNAME=cloud
HOSTNAME_EXTERNAL=cloud.dev.leaguegamer.org
LOCALSTACK_HOSTNAME=cloud
USE_SSL=false
LAMBDA_EXECUTOR=docker
DATA_DIR=/tmp/localstack/data
PORT_WEB_UI=8080
LAMBDA_DOCKER_NETWORK=leaguegamer_default
```

This is running using the `localstack/localstack` docker image
invocation_type=invocation_type,
                    )
                    try:
                        result = self._execute(lambda_function, inv_context)
                    except Exception as e:
                        raised_error = e
                        handle_error(lambda_function, event, e, asynchronous)
                        raise e
                    finally:
                        self.function_invoke_times[func_arn] = invocation_time
                        if callback:
                            callback(result, func_arn, event, error=raised_error)
                        self._lambda_result_to_destination(
                            lambda_function, event, result, asynchronous, raised_error
                        )
                    
                    return result
            return _run(func_arn=func_arn)
        
        if asynchronous:
            LOG.debug(
                "Lambda executed in Event (asynchronous) mode, no response will be returned to caller"
            )
            FuncThread(do_execute, name="lambda-execute-async").start()
            return InvocationResult(None, log_output="Lambda executed asynchronously.")
        return do_execute()
    def _execute(self, lambda_function: LambdaFunction, inv_context: InvocationContext):
        """This method must be overwritten by subclasses."""
        raise NotImplementedError
    def startup(self):