fix: remove parent dir in DeleteVolume

[andyzhangx]

What type of PR is this?
/kind bug

What this PR does / why we need it:
fix: remove parent dir in DeleteVolume

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

[pod/csi-smb-controller-794dfcb554-sd6gc/smb] I0915 05:07:46.821458       1 utils.go:76] GRPC call: /csi.v1.Controller/DeleteVolume
[pod/csi-smb-controller-794dfcb554-sd6gc/smb] I0915 05:07:46.821498       1 utils.go:77] GRPC request: {"secrets":"***stripped***","volume_id":"smb-server.default.svc.cluster.local/share#smb-6446/pvc-t8w7t#pvc-537d3618-595b-4796-81f6-794effd6d54e#"}
[pod/csi-smb-controller-794dfcb554-sd6gc/smb] I0915 05:07:46.821684       1 controllerserver.go:169] DeleteVolume: found mountOptions(dir_mode=0777,file_mode=0777,uid=0,gid=0,mfsymlinks) for volume(smb-server.default.svc.cluster.local/share#smb-6446/pvc-t8w7t#pvc-537d3618-595b-4796-81f6-794effd6d54e#)
[pod/csi-smb-controller-794dfcb554-sd6gc/smb] I0915 05:07:46.821757       1 controllerserver.go:189] begin to delete or archive subdirectory since secret is provided
[pod/csi-smb-controller-794dfcb554-sd6gc/smb] I0915 05:07:46.821931       1 controllerserver.go:330] internally mounting //smb-server.default.svc.cluster.local/share at /tmp/pvc-537d3618-595b-4796-81f6-794effd6d54e
[pod/csi-smb-controller-794dfcb554-sd6gc/smb] I0915 05:07:46.822328       1 nodeserver.go:209] NodeStageVolume: targetPath(/tmp/pvc-537d3618-595b-4796-81f6-794effd6d54e) volumeID(smb-server.default.svc.cluster.local/share#smb-6446/pvc-t8w7t#pvc-537d3618-595b-4796-81f6-794effd6d54e#) context(map[source://smb-server.default.svc.cluster.local/share]) mountflags([dir_mode=0777,file_mode=0777,uid=0,gid=0,mfsymlinks file_mode=0777]) mountOptions([dir_mode=0777,file_mode=0777,uid=0,gid=0,mfsymlinks file_mode=0777])
[pod/csi-smb-controller-794dfcb554-sd6gc/smb] I0915 05:07:46.822750       1 mount_linux.go:218] Mounting cmd (mount) with arguments (-t cifs -o dir_mode=0777,file_mode=0777,uid=0,gid=0,mfsymlinks,file_mode=0777,<masked> //smb-server.default.svc.cluster.local/share /tmp/pvc-537d3618-595b-4796-81f6-794effd6d54e)
[pod/csi-smb-controller-794dfcb554-sd6gc/smb] I0915 05:07:46.867097       1 nodeserver.go:241] volume(smb-server.default.svc.cluster.local/share#smb-6446/pvc-t8w7t#pvc-537d3618-595b-4796-81f6-794effd6d54e#) mount "//smb-server.default.svc.cluster.local/share" on "/tmp/pvc-537d3618-595b-4796-81f6-794effd6d54e" succeeded
[pod/csi-smb-controller-794dfcb554-sd6gc/smb] I0915 05:07:46.867414       1 controllerserver.go:242] removing subdirectory at /tmp/pvc-537d3618-595b-4796-81f6-794effd6d54e/smb-6446 on internalVolumePath /tmp/pvc-537d3618-595b-4796-81f6-794effd6d54e/smb-6446/pvc-t8w7t
[pod/csi-smb-controller-794dfcb554-sd6gc/smb] I0915 05:07:46.873482       1 controllerserver.go:348] internally unmounting /tmp/pvc-537d3618-595b-4796-81f6-794effd6d54e
[pod/csi-smb-controller-794dfcb554-sd6gc/smb] I0915 05:07:46.873510       1 nodeserver.go:264] NodeUnstageVolume: CleanupMountPoint on /tmp/pvc-537d3618-595b-4796-81f6-794effd6d54e with volume smb-server.default.svc.cluster.local/share#smb-6446/pvc-t8w7t#pvc-537d3618-595b-4796-81f6-794effd6d54e#
[pod/csi-smb-controller-794dfcb554-sd6gc/smb] I0915 05:07:46.873578       1 mount_helper_common.go:93] unmounting "/tmp/pvc-537d3618-595b-4796-81f6-794effd6d54e" (corruptedMount: false, mounterCanSkipMountPointChecks: true)
[pod/csi-smb-controller-794dfcb554-sd6gc/smb] I0915 05:07:46.873597       1 mount_linux.go:360] Unmounting /tmp/pvc-537d3618-595b-4796-81f6-794effd6d54e
[pod/csi-smb-controller-794dfcb554-sd6gc/smb] I0915 05:07:46.879301       1 mount_helper_common.go:150] Deleting path "/tmp/pvc-537d3618-595b-4796-81f6-794effd6d54e"
[pod/csi-smb-controller-794dfcb554-sd6gc/smb] I0915 05:07:46.879522       1 nodeserver.go:273] NodeUnstageVolume: unmount volume smb-server.default.svc.cluster.local/share#smb-6446/pvc-t8w7t#pvc-537d3618-595b-4796-81f6-794effd6d54e# on /tmp/pvc-537d3618-595b-4796-81f6-794effd6d54e successfully

Does this PR introduce a user-facing change?:

fix: remove parent dir in DeleteVolume

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andyzhangx

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• OWNERS [andyzhangx]

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[coveralls]

Pull Request Test Coverage Report for Build 10868039423

Details

• 9 of 11 (81.82%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.009%) to 78.914%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/smb/controllerserver.go	5	7	71.43%

Totals
Change from base Build 10867357119:	0.009%
Covered Lines:	988
Relevant Lines:	1252

---

💛 - Coveralls

[andyzhangx]

/retest