[fix] reference counting of used volumes on Windows nodes

[vitaliy-leschenko]

What type of PR is this?
/kind bug

Which issue(s) this PR fixes:
The driver calls Remove-SmbGlobalMapping when it still required for other volumes.

How to reproduce the issue:

1. create persistent volume A without storageClass for \fileserver\fileshare
2. create persistent volume B without storageClass for the same path (\fileserver\fileshare)
3. create pv claims AC and BC
4. create pods AP with mounted pvc AC and pod BP with mounted BC
5. remove only pod AP
6. the drivers calls Remove-SmbGlobalMapping for \fileserver\fileshare <== bug

Release note:

[fix] reference counting of used volumes on Windows nodes

[k8s-ci-robot]

Hi @vitaliy-leschenko. Thanks for your PR.

I'm waiting for a kubernetes-csi member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[andyzhangx]

/ok-to-test

[coveralls]

Pull Request Test Coverage Report for Build 6560259839

• 4 of 4 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 80.018%

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Totals
Change from base Build 6081536992:	0.0%
Covered Lines:	901
Relevant Lines:	1126

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💛 - Coveralls

[andyzhangx]

btw, other test failures would be fixed by #677

[andyzhangx]

FAIL: TestIncementVolumeIDReferencesCount (0.00s)

[vitaliy-leschenko]

FAIL: TestIncementVolumeIDReferencesCount (0.00s)

fixed

[andyzhangx]

/retest

[andyzhangx]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andyzhangx, vitaliy-leschenko

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[vitaliy-leschenko]

@andyzhangx When can we expect a new release?

[andyzhangx]

@andyzhangx When can we expect a new release?

@vitaliy-leschenko early Nov, is that ok?

[vitaliy-leschenko]

@vitaliy-leschenko early Nov, is that ok?

Ok. Thank you.