[stable/cert-manager]: Add support for affinity and tolerations

[kiall]

Adds support for setting the node affinity and tolerations scheduling options

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: kiall
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[k8s-ci-robot]

Hi @kiall. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[unguiculus]

cc @munnerz

[unguiculus]

@kiall The upstream version of the cert-manager chart in the cert-manager repo: https://github.com/jetstack/cert-manager/tree/master/contrib/charts/cert-manager. The Jetstack folks prefer to make changes there and then push them over here. You may want to reopen a PR over there.

[kiall]

I've submitted a copy of this PR over @ cert-manager/cert-manager#350

Will close this for now!