Cherry pick #4261 (magnum microversion) to cluster-autoscaler-release-1.22 #4283
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Magnum allows using the microversion string "latest", and it will replace it internally with the highest microversion that it supports. This will let the autoscaler use microversion 1.10 which allows scaling groups to 0 nodes, if it is available. The autoscaler will still be able to use microversion 1.9 on older versions of magnum.
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Issue #4254
PR #4261
Fix the magnum API microversion used, to enable scaling node groups to size 0.