fix: fix failed task retry repeated when there are multi workers #646
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This commit fixs #633
When start more than one worker, a failed task would be put in delayed queue and consumed more than once by the workers, with goredis as backend.
This is mainly because currently no transaction provided for ZRevRangeByScore and ZRem in nextDelayedTask， and this patch fixes the issue, with the correct way to make use of Redis Watch