Fixes#1610
1. In `talosconfig`, deprecate `Target` in favor of `Endpoints`
(client-side LB to come next).
2. In `osctl`, use `--nodes` in place of `--target`.
3. In `osctl` add option `--endpoints` to override `Endpoints` for the
call.
Other changes are just updates to catch up with the changes. Most
probably I missed something... And CAPI provider needs update.
Signed-off-by: Andrey Smirnov <smirnov.andrey@gmail.com>
