polish #761 update pkg name & maven coordinate for Greenwich

spring-cloud-alibaba-examples/sentinel-example/sentinel-dubbo-example/sentinel-dubbo-api/pom.xml

@@ -3,14 +3,14 @@
          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
 
     <parent>
-        <groupId>org.springframework.cloud</groupId>
+        <groupId>com.alibaba.cloud</groupId>
         <artifactId>spring-cloud-alibaba-examples</artifactId>
         <version>0.9.1.BUILD-SNAPSHOT</version>
         <relativePath>../../../pom.xml</relativePath>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
-
+    <groupId>com.alibaba.cloud</groupId>
     <artifactId>sentinel-dubbo-api</artifactId>
     <packaging>jar</packaging>
     <description>api for sentinel dubbo example</description>

spring-cloud-alibaba-examples/sentinel-example/sentinel-dubbo-example/sentinel-dubbo-api/src/main/java/com/alibaba/cloud/examples/FooService.java

@@ -0,0 +1,10 @@
+package com.alibaba.cloud.examples;
+
+/**
+ * @author fangjian
+ */
+public interface FooService {
+
+	String hello(String name);
+
+}

spring-cloud-alibaba-examples/sentinel-example/sentinel-dubbo-example/sentinel-dubbo-api/src/main/java/org/springframework/cloud/alibaba/cloud/examples/FooService.java

@@ -1,10 +0,0 @@
-package org.springframework.cloud.alibaba.cloud.examples;
-
-/**
- * @author fangjian
- */
-public interface FooService {
-
-    String hello(String name);
-
-}