docs: def avail_locations(conn=None, call=None):
      '''
      List available locations/datacenters for 1&1
      '''
      if call == 'action':
          raise SaltCloudSystemExit(
              'The avail_locations function must be called with '
              '-f or --function, or with the --list-locations option'
          )
  
      datacenters = []
  
      if not conn:
          conn = get_conn()
  
      for datacenter in conn.list_datacenters():
          datacenters.append({datacenter['country_code']: datacenter})
  
      return {'Locations': datacenters}