protected void addComponentMapping(Class<? extends IComponent> klazz, IComponent component) {
        components.put(klazz, component);
    }
Add a component that may have been instantiated elsewhere.
@param klazz component class
@param component instantiated component of same class
gateway/engine/core/src/main/java/io/apiman/gateway/engine/impl/ConfigDrivenComponentRegistry.java