修正回放错误，优化sdp排序，提高设备兼容性

Lawrence

2021-01-10 d5026897c1855e92191e60545dcfea58c2efdfb6

 src/main/java/com/genersoft/iot/vmp/gb28181/event/platformKeepaliveExpire/PlatformKeepaliveExpireEventLister.java

@@ -52,6 +52,7 @@
        }
        ParentPlatform parentPlatform = storager.queryParentPlatById(event.getPlatformGbID());
        ParentPlatformCatch parentPlatformCatch = redisCatchStorage.queryPlatformCatchInfo(event.getPlatformGbID());
        parentPlatformCatch.setParentPlatform(parentPlatform);
        if (parentPlatform == null) {
            logger.debug("平台心跳到期事件事件触发，但平台已经删除!!! 平台国标ID：" + event.getPlatformGbID());
            return;