ethtool: add replacement for ethtool -k and -l

[ffromani]

Add commands to act as simple replacement for ethtool -l and ethtool -k.

even though very recent linux kernel implemented a new and more capable netlink interface to query the ethernet properties, we intentionally consume a ioctl-based package because:

1. ioctl capabilities are fine for our use case (we don't need more modern and powerful features enabled by netlink just yet)
2. we maximize the backward compatibility
3. netlink-based packages are less mature

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fromanirh

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[ffromani]

also, e2e tests are missing (and not really sure how to add them yet)

[ffromani]

also, e2e tests are missing (and not really sure how to add them yet)

e2e tests, at least a basic version of them, added

[yanirq]

/lgtm