Refresh instances in autoscaling group when launch configuration changes #1208
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* Changes to worker launch configurations start an autoscaling group instance refresh to replace instances * Instance refresh creates surge instances, waits for a warm-up period, then deletes old instances * Changing worker_type, disk_*, worker_price, worker_target_groups, or Butane worker_snippets on existing worker nodes will replace instances * New AMIs or changing `os_stream` will be ignored, to allow Fedora CoreOS or Flatcar Linux to keep themselves updated * Previously, new launch configurations were made in the same way, but not applied to instances unless manually replaced
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worker_type,disk_*,worker_price,worker_target_groups, or Butaneworker_snippetson existing worker nodes will replace instancesos_streamwill be ignored, to allow Fedora CoreOS or Flatcar Linux to keep themselves updated