On-demand pricing only available for spot instances

[dobesv]

Currently the system pulls a list of regions / instance types based on a provided label that denotes a node as being a spot instance.

This list is used to fetch both spot and on-demand instance pricing.

However, we want to use this tool to try and calculate an overall cost of the cluster, which means we want on-demand prices for on-demand instances, and spot prices for spot instances.

As a workaround I can provide a --spot-label argument which is a label common to ALL nodes. This way I simply get spot and on-demand pricing for all the node types used in the system.

But ideally I think for the on-demand pricing it would simply fetch prices for all nodes in the system, regardless of the spot-worker label.