private void nextPartition() {
            this.partition = this.partitions.get(0);
            this.partitions.remove(0);
            this.offset = 0;
            this.it = null;
        }
TopicBrowser implementation.

@author dennis<killme2008@gmail.com>
@since 1.4.5
metamorphosis-client/src/main/java/com/taobao/metamorphosis/client/MetaTopicBrowser.java