[3.5] Backport two lease related bug fixes to 3.5 #14087
Merged
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Backport pull/14067 and pull/14078 to 3.5.
The first bug fix is to resolve the race condition between goroutine and channel on the same leases to be revoked. It's a classic mistake in using Golang channel + goroutine. Please refer to effective_go#channels.
The second bug fix is to resolve the issue that etcd lessor may continue to schedule checkpoint after stepping down the leader role.