This is an issue found in simulation that when the cluster controller cannot communicate with a registered worker, the CC will be blocked in broadcastDBInfoRequest indefinitely. When a new worker joins the cluster, although updateDBInfo.trigger() is called, it won't trigger a new serverDbInfo updater.

This PR fixes this issue by starting a new round of DbInfo updater in the middle of broadcastDBInfoRequest.

20230322-045023-zhewu_dbinfo-fd9717d34cd8da39

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