demo: Improve remoteAddress and groupId of sentinel-demo-nacos-datasource (#2134)

* Update NacosConfigSender.java
* Update NacosDataSourceDemo.java
* fix(Nacos Demo): remoteAddress error

sentinel-demo/sentinel-demo-nacos-datasource/src/main/java/com/alibaba/csp/sentinel/demo/datasource/nacos/NacosConfigSender.java

@@ -26,8 +26,8 @@ import com.alibaba.nacos.api.config.ConfigService;
 public class NacosConfigSender {
 
     public static void main(String[] args) throws Exception {
-        final String remoteAddress = "localhost";
-        final String groupId = "Sentinel:Demo";
+        final String remoteAddress = "localhost:8848";
+        final String groupId = "Sentinel_Demo";
         final String dataId = "com.alibaba.csp.sentinel.demo.flow.rule";
         final String rule = "[\n"
             + "  {\n"

sentinel-demo/sentinel-demo-nacos-datasource/src/main/java/com/alibaba/csp/sentinel/demo/datasource/nacos/NacosDataSourceDemo.java

@@ -37,9 +37,9 @@ public class NacosDataSourceDemo {
 
     private static final String KEY = "TestResource";
     // nacos server ip
-    private static final String remoteAddress = "localhost";
+    private static final String remoteAddress = "localhost:8848";
     // nacos group
-    private static final String groupId = "Sentinel:Demo";
+    private static final String groupId = "Sentinel_Demo";
     // nacos dataId
     private static final String dataId = "com.alibaba.csp.sentinel.demo.flow.rule";
     // if change to true, should be config NACOS_NAMESPACE_ID