public RoutingTableSpec addHop(String name, String selector, List<String> recipients) {
        return addHop(new HopSpec(name, selector).addRecipients(recipients));
    }
A convenience function to add a new hop to this routing table.

@param name       A protocol-unique name for this hop.
@param selector   A string that represents the selector for this hop.
@param recipients A list of recipients for this hop.
@return This, to allow chaining.
messagebus/src/main/java/com/yahoo/messagebus/routing/RoutingTableSpec.java