Add preemptible and automatic_restart options on GCE instance

[haklop]

Add preemptible (https://cloud.google.com/compute/docs/instances/preemptible) and automatic_restart (https://cloud.google.com/compute/docs/instances/#autorestart) options on GCE instance

[sparkprime]

These should be in a nested structure called "scheduling" so we don't drift too far away from the official schema.

[sparkprime]

May as well also add the third one "on_host_maintenance"

They don't have to be ForceNew either, but it's fine to make them ForceNew in a first pass and then add update ability later.

[sparkprime]

This is useful, thanks

[radeksimko]

@haklop it would be nice to get this in, do you plan to apply suggested changes? 😉

[sparkprime]

This probably needs to be added to the instance template resource too. I'm going to suggest @lwander finish this off but thanks @haklop for getting us most of the way there :)

[sparkprime]

Thanks for the headstart, @haklop! I'm closing this as the feature is now in.

[ghost]

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