pd: adjust log level (#7071)
pd: adjust log level (#7071)

Signed-off-by: disksing <042dc4512fa3d391c5170cf3aa61e6a638f84342@disksing.com>
BusyJay/tikv,c4pt0r/tikv,BusyJay/tikv,pingcap/tikv,BusyJay/tikv,BusyJay/tikv,pingcap/tikv