Add support for preemptible instances

[alexander-demicev]

What this PR does / why we need it:
The PR adds support for preemptible instances

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

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[k8s-ci-robot]

Hi @alexander-demichev. Thanks for your PR.

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[detiber]

/ok-to-test

/assign @JoelSpeed

[JoelSpeed]

I'm aware you're currently trying to test this out, could you post some confirmation once you've done your manual testing

Do we think it's worth trying to add a test to the scope tests that verify passing preemptible actually calls run instances with the right option?

[JoelSpeed]

@alexander-demichev Did you ever get around to spinning up a CAPI cluster to test this out?

[fejta-bot]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
Stale issues rot after an additional 30d of inactivity and eventually close.

If this issue is safe to close now please do so with /close.

Send feedback to sig-testing, kubernetes/test-infra and/or fejta.
/lifecycle stale

[detiber]

/remove-lifecycle stale

[detiber]

/retest

[cpanato]

@alexander-demichev did you have a chance to look in this comment: #300 (review)

I would like to proceed on this, i will also try to test this out

[alexander-demicev]

@cpanato It would be awesome if you can test the PR on a real cluster.

[cpanato]

/approve
/lgtm

all good did not see any issues

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cpanato

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