Merge pull request #1345 from zhipingwu/bugfix-character-encoding20191208

修复bug: 执行器线程阻塞时给管理器返回的json中有特殊符号，导致管理器端一直报错, 使用getBytes utf-8即可。

xxl-job-core/src/main/java/com/xxl/job/core/util/XxlJobRemotingUtil.java

@@ -57,7 +57,7 @@ public class XxlJobRemotingUtil {
             String requestBody = BasicJson.toJson(requestObj);
 
             DataOutputStream dataOutputStream = new DataOutputStream(connection.getOutputStream());
-            dataOutputStream.writeBytes(requestBody);
+            dataOutputStream.write(requestBody.getBytes("UTF-8"));
             dataOutputStream.flush();
             dataOutputStream.close();