Adds reconstructURI method to ReactorLoadBalancerExchangeFilterFunction

fixes gh-711

Author: timothymathison

spring-cloud-commons/src/main/java/org/springframework/cloud/client/loadbalancer/reactive/ReactorLoadBalancerExchangeFilterFunction.java

@@ -80,11 +80,15 @@ public Mono<ClientResponse> filter(ClientRequest request, ExchangeFunction next)
 						serviceId, instance.getUri()));
 			}
 			ClientRequest newRequest = buildClientRequest(request,
-					LoadBalancerUriTools.reconstructURI(instance, originalUrl));
+					reconstructURI(instance, originalUrl));
 			return next.exchange(newRequest);
 		});
 	}
 
+	protected URI reconstructURI(ServiceInstance instance, URI original) {
+		return LoadBalancerUriTools.reconstructURI(instance, original);
+	}
+
 	protected Mono<Response<ServiceInstance>> choose(String serviceId) {
 		ReactiveLoadBalancer<ServiceInstance> loadBalancer = loadBalancerFactory
 				.getInstance(serviceId);