Add CapacityOptimized to list of supported spot allocation strategies

[gjtempleton]

Adds the new CapacityOptimized spot allocation strategy to the list of supported spot allocation strategies. More info about the new allocation strategy found here: https://aws.amazon.com/blogs/compute/introducing-the-capacity-optimized-allocation-strategy-for-amazon-ec2-spot-instances/

Marking as WIP until the merging of #7404 and hashicorp/terraform-provider-aws#9750 as I've not had the chance to test it yet and Terraform will need to support it first.

EDIT: Discussed at Office Hours on the 8th of November and decided Terraform support is no longer a blocker for this.

Intended to resolve #7401

[k8s-ci-robot]

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[hrzbrg]

@gjtempleton @robinpercy Cheers, it would be really cool if this feature would land in a near future release. Any help needed still to make progress?

[gjtempleton]

I was initially held up by being unsure whether I needed to wait for terraform to support it as well as CloudFormation. We discussed it at Office Hours yesterday and found a solution for now, will get this in shape by the end of this weekend.

Thanks for the offer @hrzbrg.

[gjtempleton]

Now ready for review and tested locally. Only area I'm unsure on is whether the Terraform warning is in the right place.

[gjtempleton]

/assign @KashifSaadat

[gjtempleton]

/ok-to-test

[KashifSaadat]

Thanks for the contribution!

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gjtempleton, KashifSaadat

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