多条命令时，重新获取cid

mpmaster/src/main/java/com/xypower/mpmaster/AppMaster.java

@@ -506,6 +506,7 @@ public class AppMaster {
                 for (int idx = 0; idx < cnt; idx++) {
                     JSONObject cmdObject = cmdObjects.getJSONObject(idx);
                     if (cmdObject != null) {
+                        cid = jsonObject.optLong("cid", 0);
                         processCmd(cid, cmdObject);
                     }
                 }