Automatic merge from submit-queue (batch tested with PRs 55034, 55068). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Close the file before renaming in FileStore

Also change the unit test to use a real file system to detect errors
like this.