Fix krew auto completion command not found at lower version

[zhengtianbao]

What type of PR is this?

/kind bug

What this PR does / why we need it:

krew version under v0.4.2 has no sub command of completion, should skip this task.

Which issue(s) this PR fixes:

Fixes #8174

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

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[floryut]

/ok-to-test

Fine by me to fix this asap, but checking for lower version could be better wouldn't it ?

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floryut, zhengtianbao

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[oomichi]

On Kubespray, krew version has been updated to v0.4.2 since #8168
On master branch, I guess we don't face this issue, right?

[oomichi]

On Kubespray, krew version has been updated to v0.4.2 since #8168 On master branch, I guess we don't face this issue, right?

I might mean #8174 has been fixed already since #8168

[zhengtianbao]

Under normal circumstances, this problem (like #8174) should not have occurred. This PR is just as a more reliable solution.

[oomichi]

Under normal circumstances, this problem (like #8174) should not have occurred. This PR is just as a more reliable solution.

Ah, I got it.
Even if specifying v0.4.2 for krew, the binary could be v0.4.1 or older if the binary is already there in the machine due to the previous Kubespray run.
I am ok to go with this.

/lgtm