nacos discovery endpoint support spring.cloud.nacos.discovery.enabled , Polish #411

spring-cloud-alibaba-nacos-discovery/src/main/java/org/springframework/cloud/alibaba/nacos/discovery/NacosDiscoveryClientAutoConfiguration.java

@@ -18,6 +18,7 @@ package org.springframework.cloud.alibaba.nacos.discovery;
 
 import org.springframework.boot.autoconfigure.AutoConfigureBefore;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.cloud.alibaba.nacos.ConditionalOnNacosDiscoveryEnabled;
 import org.springframework.cloud.alibaba.nacos.NacosDiscoveryProperties;
@@ -33,6 +34,7 @@ import org.springframework.context.annotation.Configuration;
 @Configuration
 @ConditionalOnNacosDiscoveryEnabled
 @EnableConfigurationProperties
+@ConditionalOnProperty(value = "spring.cloud.nacos.discovery.enabled", matchIfMissing = true)
 @AutoConfigureBefore({ SimpleDiscoveryClientAutoConfiguration.class,
 		CommonsClientAutoConfiguration.class })
 public class NacosDiscoveryClientAutoConfiguration {

spring-cloud-alibaba-nacos-discovery/src/main/resources/META-INF/additional-spring-configuration-metadata.json

@@ -5,6 +5,12 @@
       "defaultValue": "${spring.application.name}",
       "description": "the service name to register, default value is ${spring.application.name}."
     },
+    {
+      "name": "spring.cloud.nacos.discovery.enabled",
+      "type": "java.lang.Boolean",
+      "defaultValue": true,
+      "description": "enable nacos discovery or not."
+    },
     {
       "name": "spring.cloud.nacos.discovery.namingLoadCacheAtStart",
       "type": "java.lang.Boolean",