List all trails

    Returns list of trails

    CLI Example:

    .. code-block:: yaml

        policies:
          - {...}
          - {...}

def list(region=None, key=None, keyid=None, profile=None):
    '''
    List all trails

    Returns list of trails

    CLI Example:

    .. code-block:: yaml

        policies:
          - {...}
          - {...}

    '''
    try:
        conn = _get_conn(region=region, key=key, keyid=keyid, profile=profile)
        trails = conn.describe_trails()
        if not bool(trails.get('trailList')):
            log.warning('No trails found')
        return {'trails': trails.get('trailList', [])}
    except ClientError as e:
        return {'error': __utils__['boto3.get_error'](e)}