Update ambassador-rbac.yaml

[westford14]

What this PR does / why we need it:

Updates the notebooks/resources/ambassador-rbac.yaml to use the apps/v1 apiversion since the extensions/v1beta has been fully deprecated. Also adding the appropriate selector labels. This resolves #3677

Which issue(s) this PR fixes:
Fixes #3677

Special notes for your reviewer:

Does this PR introduce a user-facing change?: Yes

* updates Deployment apiversion in `notebooks/resources/ambassdor-rbac.yaml` 

[seldondev]

Hi @westford14. Thanks for your PR.

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[seldondev]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[westford14]

/assign @majolo

[ukclivecox]

Thanks @westford14