This keeps backwards compatibility with `osctl` CLI binary with the
exception of `osctl config generate` which was renamed to `osctl
gen config` to avoid confusion with other `osctl config`
commands which operate on client config, not Talos server config.
Command implementation and helpers were split into subpackages for
cleaner code and more visible boundaries. The resulting binary still
combines commands from both sections into a single binary.
Signed-off-by: Andrey Smirnov <smirnov.andrey@gmail.com>
