Create changelog v8.1.0

[dfajmon]

What type of PR is this? /kind documentation

What this PR does / why we need it: Update changelog v8.1.0

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

Hi @dfajmon. Thanks for your PR.

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[dfajmon]

@xing-yang updated, thanks for the review

[xing-yang]

/ok-to-test

[xing-yang]

/lgtm /approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dfajmon, xing-yang

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