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Automatic merge from submit-queue (batch tested with PRs 47484, 47904, 48034) fix nits in kubelet server Signed-off-by: allencloud <allen.sun@daocloud.io> **What this PR does / why we need it**: fix nits in kubelet server **Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes # NONE **Special notes for your reviewer**: NONE **Release note**: ```release-note NONE ```