增加对Subscribe（订阅）方法的支持

Lawrence

2021-01-27 bf76240724234307bfc5f5bc2e345ad896ae16bd

 src/main/java/com/genersoft/iot/vmp/media/zlm/ZLMRESTfulUtils.java

@@ -116,4 +116,8 @@
    public JSONObject openRtpServer(Map<String, Object> param){
        return sendPost("openRtpServer",param);
    }

    public JSONObject closeRtpServer(Map<String, Object> param) {
        return sendPost("closeRtpServer",param);
    }
}