[#4676] optimized the method of building ServiceCenterClient

Author: chengyouling

clients/service-center-client/src/main/java/org/apache/servicecomb/service/center/client/ServiceCenterClient.java

@@ -69,10 +69,11 @@ public class ServiceCenterClient implements ServiceCenterOperation {
 
   private EventBus eventBus;
 
-  private ServiceCenterAddressManager addressManager;
+  private final ServiceCenterAddressManager addressManager;
 
-  public ServiceCenterClient(ServiceCenterRawClient httpClient) {
+  public ServiceCenterClient(ServiceCenterRawClient httpClient, ServiceCenterAddressManager addressManager) {
     this.httpClient = httpClient;
+    this.addressManager = addressManager;
   }
 
   public ServiceCenterClient setEventBus(EventBus eventBus) {

service-registry/registry-service-center/src/main/java/org/apache/servicecomb/registry/sc/SCClientUtils.java

@@ -66,7 +66,7 @@ public static ServiceCenterClient serviceCenterClient(SCConfigurationProperties
     return new ServiceCenterClient(new ServiceCenterRawClient.Builder()
         .setTenantName("default")
         .setAddressManager(addressManager)
-        .setHttpTransport(createHttpTransport(environment, sslProperties)).build());
+        .setHttpTransport(createHttpTransport(environment, sslProperties)).build(), addressManager);
   }
 
   private static HttpTransport createHttpTransport(Environment environment, SSLProperties sslProperties) {