server: make leader can lost lease as soon as possible (#3712)#3719

Merged

ti-chi-bot merged 3 commits intotikv:release-5.0from ti-chi-bot:cherry-pick-3712-to-release-5.0

May 28, 2021

+39-6

Commits on May 27, 2021

This is an automated cherry-pick of tikv#3712

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reslove conflict
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Commits on May 28, 2021

Merge branch 'release-5.0' into cherry-pick-3712-to-release-5.0
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