docs: def get_all_mfa_devices(user_name, region=None, key=None, keyid=None,
                          profile=None):
      '''
      Get all MFA devices associated with an IAM user.
  
      .. versionadded:: 2016.3.0
  
      CLI Example:
  
      .. code-block:: bash
  
          salt myminion boto_iam.get_all_mfa_devices user_name
      '''
      user = get_user(user_name, region, key, keyid, profile)
      if not user:
          log.error('IAM user %s does not exist', user_name)
          return False
      conn = _get_conn(region=region, key=key, keyid=keyid, profile=profile)
      try:
          result = conn.get_all_mfa_devices(user_name)
          devices = result['list_mfa_devices_response']['list_mfa_devices_result']['mfa_devices']
          return devices
      except boto.exception.BotoServerError as e:
          log.debug(e)
          if 'Not Found' in e:
              log.info('Could not find IAM user %s.', user_name)
              return []
          log.error('Failed to get all MFA devices for IAM user %s.', user_name)
          return False