Spot node pools

[Carus11]

Is your feature request related to a problem? Please describe.

Not related to a problem

Describe the solution you'd like

The spot node pool functionality is partially implemented yet commented out. Enabling the use of spot nodes would greatly improve the cost situation when running these environments in short term deployments for technical validation, or demos.

Describe alternatives you've considered

Considered using the small sizings. But there is a floor to the size of a viya environment which is still fairly costly.

Additional context

I understand that there has been some concern in the past about this feature not being a supported pattern, but I believe the option should be available for those of us creating environments which we know will be unstable because of how spot instances work. The configuration variable could use a notice regarding the support status to drive this home.

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