add the unparam linter to golangci and fix those issues flagged

[kannon92]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

add linter for unused parameters.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

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[danielvegamyhre]

/lgtm /approve

Thanks for adding this!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: danielvegamyhre, kannon92

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