tikv_util: handle cgroup path building error (#12485)#76

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CalvinNeo wants to merge 1 commit intopingcap:merge-raftstore-proxy-to-6.1from CalvinNeo:cp-tikv-45607-on-master

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Commits on Jun 1, 2022

tikv_util: handle cgroup path building error (tikv#12485 )

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