test: move SocketDemo to package demo

Author: oldratlee

…est/java/com/alibaba/dcm/SocketDemo.java …st/java/com/alibaba/demo/SocketDemo.javalibrary/src/test/java/com/alibaba/dcm/SocketDemo.java renamed to library/src/test/java/com/alibaba/demo/SocketDemo.java library/src/test/java/com/alibaba/dcm/SocketDemo.java renamed to library/src/test/java/com/alibaba/demo/SocketDemo.java

@@ -1,4 +1,4 @@
-package com.alibaba.dcm;
+package com.alibaba.demo;
 
 import org.apache.commons.io.IOUtils;