Automatic merge from submit-queue (batch tested with PRs 62727, 66834). 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>.
Added check for namespace file
**What this PR does / why we need it**:
This PR cleans up a bit of the code in the iks/shutdown file, so that is checks for a possible file prior to attempting to delete it. It is a very minor fix.
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
This was not previously labelled as an issue.
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
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