fix(preflight): check the system default NFS version in mount config (backport #129)

[mergify]

Which issue(s) this PR fixes:

Issue longhorn/longhorn#9830

What this PR does / why we need it:

Though the node supports NFSv4, the NFS client picks the protocol version by Defaultvers defined in nfsmount.conf. This may cause problem while using backup-related features.

Special notes for your reviewer:

Additional documentation or context

---

This is an automatic backport of pull request #129 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of b6af7b9 has failed:

On branch mergify/bp/v1.7.x/pr-129
Your branch is up to date with 'origin/v1.7.x'.

You are currently cherry-picking commit b6af7b9.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	new file:   vendor/github.com/longhorn/go-common-libs/nfs/nfs.go
	modified:   vendor/modules.txt

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   docs/longhornctl.md
	both modified:   docs/longhornctl_check.md
	both modified:   docs/longhornctl_check_preflight.md
	both modified:   docs/longhornctl_doc.md
	both modified:   docs/longhornctl_export.md
	both modified:   docs/longhornctl_export_replica.md
	both modified:   docs/longhornctl_export_replica_stop.md
	both modified:   docs/longhornctl_get.md
	both modified:   docs/longhornctl_get_replica.md
	both modified:   docs/longhornctl_global-options.md
	both modified:   docs/longhornctl_install.md
	both modified:   docs/longhornctl_install_preflight.md
	both modified:   docs/longhornctl_install_preflight_stop.md
	both modified:   docs/longhornctl_trim.md
	both modified:   docs/longhornctl_trim_volume.md
	both modified:   docs/longhornctl_version.md
	both modified:   pkg/local/preflight/checker.go

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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