*: Using the global singleton for pd client and tikv client, and fix pd client freeze (#1217)#1219

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amyangfei merged 2 commits intopingcap:release-4.0from ti-srebot:release-4.0-2a09a896ca57

Dec 16, 2020

+23-26

Commits on Dec 16, 2020

cherry pick pingcap#1217 to release-4.0

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