docs: def connect_to_region(region_name):
      """
      Establish connection to AWS API.
  
      """
      logging.debug("Connecting to AWS region '%s'" % region_name)
      con = boto.vpc.connect_to_region(region_name)
      if not con:
          raise VpcRouteSetError("Could not establish connection to "
                                 "region '%s'." % region_name)
      return con