ethernet: T9228: only warn about unsupported NIC features when node changed

EthernetIf.update() re-applies every ethernet knob on every commit touching
the interface. The capability messages (offload, flow-control, ring-buffer,
coalesce, switchdev) are emitted whenever the CLI-desired state differs from
what the driver reports - and on drivers where a feature is fixed
(virtio_net, vmxnet3, vif, veth, ...) that is permanently true. The message
is correct the first time, but it then re-appears on unrelated commits like
an interface description or IP address change.

Record in interfaces_ethernet.py which of the affected CLI nodes were
altered - the mechanism already used for speed_duplex_changed - and pass it
to the setters via a "warn" argument. Settings are still applied
unconditionally, only the message is gated.

While at it, consolidate the seven offload setters onto a common helper and
use Warning() instead of print().

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