Delete k8s cluster resource in e2e test

[MIBc]

Fixes #576

Proposed Changes

• Delete k8s cluster resource: clusterrole, clusterrolebinding after e2e test finish.

[knative-prow-robot]

Hi @MIBc. Thanks for your PR.

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[MIBc]

/assign @mattmoor

[navidshaikh]

/ok-to-test

[navidshaikh]

/approve
/lgtm

Thanks!
I've added a few suggestions, can be addressed in a subsequent PR as well.

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: MIBc, navidshaikh

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