This change adds a new command and functionality for updating
instance group configuration via command line arguments. This
behavior mimics the `set cluster` command.
This means we no longer have to individually hard-code the `kops set`
fields, however we use the "language" we're now demonstrated.
We add tests to ensure we have parity with our existing (hard-coded)
setter logic.
Introduce an experimental kops set cluster command, for setting
individual fields in the same style as the kops create cluster
--override flags.
For now, feature flag gated by the same SpecOverrideFlag feature flag.
Also split out pkg/commands package to facilitate testing.
Gabe Jackson
Justin SB
Ole Markus With
mikesplain
Adrian Fedoreanu
Justin Santa Barbara