Spotinst: New instance group type: Ocean

[liranp]

This PR adds a new instance group type, Spotinst Ocean, which abstracts the provisioning, auto scaling, and management of Kubernetes nodes.

To maintain backward compatibility we continue to create all instance groups as Spotinst Elastigroups. Spotinst Ocean support can be enabled by toggling a new feature flag on:

export KOPS_FEATURE_FLAGS="+Spotinst,SpotinstOcean"

When Spotinst Ocean's feature flag is toggled on all Node instance groups will be created as a single Spotinst Ocean cluster (nodes.<cluster-name>) with multiple LaunchSpecs (one for each instance group).

NOTE: We released this version to our customers as a custom build. This version has been tested and used by Spotinst's customers in many production environments since version 1.11.

[k8s-ci-robot]

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[mikesplain]

/ok-to-test

[chrisz100]

As it’s all feature gated
/lgtm

@mikesplain leaving the approval to you ;-)

[justinsb]

Yes, approving as it is feature-gated - thanks @liranp!

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: justinsb, liranp

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