Update reference implementation of the snapshot controller

[mauriciopoppe]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind documentation

What this PR does / why we need it:

Update in the reference implementation yaml for #504, added some properties to the RollingUpdate strategy

Does this PR introduce a user-facing change?:

NONE

/assign @msau42 @verult

[k8s-ci-robot]

Hi @mauriciopoppe. Thanks for your PR.

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[jingxu97]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jingxu97, mauriciopoppe

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[verult]

/lgtm

[msau42]

/ok-to-test