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Having upgraded to the latest LocalStack version, I've noticed that Docker containers from Lambda executions are immediately removed when they terminate.

This was added in https://github.com/localstack/localstack/pull/1584

I can appreciate the need to clean up containers, however this feature of having them stay up is actually very useful for debugging things when they go wrong!

Would it be possible to have a flag so that when running LocalStack we can specify whether to remove containers on completion? Something like:

```
services:
  localstack:
    image: localstack/localstack:latest
    ports:
      - "4567-4593:4567-4593"
    environment:
      - SERVICES=serverless,ssm,stepfunctions
      - DOCKER_HOST=unix:///var/run/docker.sock
      - LAMBDA_EXECUTOR=docker
      - REMOVE_CONTAINERS_ON_LAMBDA_TERMINATE=true #(or false)
    volumes:
      - "${TMPDIR:-/tmp/localstack}:/tmp/localstack"
      - "/var/run/docker.sock:/var/run/docker.sock"
```

Thanks for the great work folks!
bucket_name = normalize_bucket_name(bucket_name)
    lock_config = OBJECT_LOCK_CONFIGS.get(bucket_name)
    status_code = 200
    if not lock_config:
        
        lock_config = {
            'Error': {
                'Code': 'ObjectLockConfigurationNotFoundError',
                'Message': 'Object Lock configuration does not exist for this bucket'
            }
        }
        status_code = 404
    body = xmltodict.unparse(lock_config)
    return requests_response(body, status_code=status_code)
def set_lifecycle(bucket_name, lifecycle):
    bucket_name = normalize_bucket_name(bucket_name)
    
    if isinstance(to_str(lifecycle), six.string_types):
        lifecycle = xmltodict.parse(lifecycle)
    BUCKET_LIFECYCLE[bucket_name] = lifecycle
    return 200
def set_replication(bucket_name, replication):
    bucket_name = normalize_bucket_name(bucket_name)
    
    if isinstance(to_str(replication), six.string_types):
        replication = xmltodict.parse(replication)
    BUCKET_REPLICATIONS[bucket_name] = replication
    return 200
def set_encryption(bucket_name, encryption):