Automatic merge from submit-queue (batch tested with PRs 67396, 67097, 67395, 67365, 67099). 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>.
Ignore EIO error in unmount path
**What this PR does / why we need it**:
This PR ignores EIO in unmount path. XFS shuts down filesystem when the target is down and it returns EIO for the stat calls used in unmount path.
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes#66868
**Special notes for your reviewer**:
We already handle ESTALE & ENOTCONN errors in isCorruptedMnt Call. Adding EIO to that list covers the XFS shutdown case.
Also Flexvolume doesn't check for these errors in its current form. Updated Flexvolume code to handle it.
```release-note
NONE
```
5aea00d885