✨ Add Spot instances support

[alexander-demicev]

What this PR does / why we need it:
Add a new field to API - SpotMarketOptions, then use it to create spot instance by initializing an InstanceMarketOptionsRequest and passing it to RunInstances()

kubernetes-sigs/cluster-api-provider-azure#559
https://github.com/kubernetes-sigs/cluster-api/blob/master/docs/proposals/20200330-spot-instances.md

Huge thanks to @JoelSpeed for making it possible!

[k8s-ci-robot]

Hi @alexander-demichev. Thanks for your PR.

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[JoelSpeed]

@alexander-demichev Have you tested this in a live cluster?

Changes look to be identical to the openshift fork so should be good

/lgtm

[alexander-demicev]

Yes, tested on a real cluster, and yes it's similar to openshift

[randomvariable]

Looks like the CRDs need to be regenerated

make generate-go should do it.

[randomvariable]

/ok-to-test

[JoelSpeed]

/test pull-cluster-api-provider-aws-test
/lgtm

[JoelSpeed]

/lgtm cancel
@alexander-demichev You need to implement conversion from the v1alpha2 to v1alpha3 types. Take a look at the way this was done in the azure implementation for inspiration (https://github.com/kubernetes-sigs/cluster-api-provider-azure/pull/559/files)

[alexander-demicev]

@JoelSpeed done and CI works now

[JoelSpeed]

/lgtm

[randomvariable]

Great, thanks!

/approve

[k8s-ci-robot]

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