tso, server, tests: add a test case for tso allocation bug (#2675)#2678

Merged

nolouch merged 1 commit intotikv:release-4.0from ti-srebot:release-4.0-6dab049720f4

Jul 27, 2020

+96-3

Commits on Jul 23, 2020

cherry pick tikv#2675 to release-4.0

JmPotato
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ti-srebot
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