Replace knative.dev/client references with knative.dev/client-pkg

[xiangpingjiang]

Changes

• Replace knative.dev/client references with knative.dev/client-pkg

/kind cleanup
Part of knative/client#1591
Part of knative/client#1861

Fixes #

Release Note

Docs

[knative-prow]

Welcome @xiangpingjiang! It looks like this is your first PR to knative-extensions/kn-plugin-sample 🎉

[knative-prow]

Hi @xiangpingjiang. Thanks for your PR.

I'm waiting for a knative-extensions 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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[rhuss]

Thanks! Looks good to me
/approve
/lgtm

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rhuss, xiangpingjiang

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