fix: add workaround for blobfuse2 mount race condition issue

[andyzhangx]

What type of PR is this?
/kind bug

What this PR does / why we need it:
fix: add workaround for blobfuse2 mount issue
unlike blobfusev1, blobfuse2 would create a new child process to handle mount, thus blobfuse2 mount becomes async now, there would be race condition between real mount process and next bind mount operation if it's async mount,
this PR would sleep 2s waiting for mount process complete
details: Azure/azure-storage-fuse#1079

Which issue(s) this PR fixes:

Fixes #

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Special notes for your reviewer:

• verified manually, after sleep 2s, there is no more mount on local disk any more:

# mount | grep blobfuse2
blobfuse2 on /var/lib/kubelet/plugins/kubernetes.io/csi/blob.csi.azure.com/1f778bb6414796cfefe77ad67ee6e5f21be127ed1adf86affb766488a15ebee4/globalmount type fuse (rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other)
blobfuse2 on /var/lib/kubelet/pods/5a555547-46b4-45f3-8da6-4896903a8dd3/volumes/kubernetes.io~csi/pvc-32e09edb-ac53-4240-976a-6e810e270018/mount type fuse (rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other)
root@aks-agentpool-20541019-vmss000000:/# mount | grep sda
/dev/sda1 on / type ext4 (rw,relatime,discard)
/dev/sda15 on /boot/efi type vfat (rw,relatime,fmask=0077,dmask=0077,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro)
/dev/sda1 on /var/lib/kubelet type ext4 (rw,relatime,discard)

• also there is no device or resource busy during unmount now

Release note:

fix: add workaround for blobfuse2 mount race condition issue

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andyzhangx

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[andyzhangx]

/assign @cvvz

[andyzhangx]

/retest

[andyzhangx]

/cherrypick release-1.20
/cherrypick release-1.19

[k8s-infra-cherrypick-robot]

@andyzhangx: once the present PR merges, I will cherry-pick it on top of release-1.20 in a new PR and assign it to you.

In response to this:

/cherrypick release-1.20
/cherrypick release-1.19

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[andyzhangx]

/hold

[k8s-ci-robot]

@andyzhangx: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-blob-csi-driver-e2e-capz	fa9f8a5	link	true	/test pull-blob-csi-driver-e2e-capz

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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. I understand the commands that are listed here.

[k8s-infra-cherrypick-robot]

@andyzhangx: cannot checkout release-1.20: error checking out release-1.20: exit status 1. output: error: pathspec 'release-1.20' did not match any file(s) known to git

In response to this:

/cherrypick release-1.20
/cherrypick release-1.19

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.

[k8s-infra-cherrypick-robot]

@andyzhangx: new pull request created: #843

In response to this:

/cherrypick release-1.20
/cherrypick release-1.19

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]

/cherrypick release-1.20

[k8s-infra-cherrypick-robot]

@andyzhangx: new pull request created: #844

In response to this:

/cherrypick release-1.20

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.