smoketest: T8264: cover the DCO data path

Checking the link kind cannot tell a working offload from a device in
the wrong operating mode, so compare the mode the Kernel reports. Cover
enabling DCO on a running interface, a client, which is the only case
where VyOS is definitively the one creating the device, and a raw option
where it deliberately is not.

Every rejection in the verify test stops before apply(), so the offload
is re-checked after a change that actually reaches it.

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