[DNM]tidb-cse-7.5: update pd client set ru setting#1689

ystaticy wants to merge 4 commits intotikv:tidb-cse-7.5tikv/client-go:tidb-cse-7.5from

ystaticy:yjy_pd_client_set_ruystaticy/client-go:yjy_pd_client_set_ruCopy head branch name to clipboard