rename `mdlayher/netlink` imports

[danwinship]

The code uses both mdlayher/netlink and vishvananda/netlink, and renames the latter (to vishnetlink) but not the former.

This is likely to be confusing to people coming from other k8s codebases, since we only use the vishvananda library in most places, so people browsing the code would assume netlink.Foo referred to that. So probably it would be good to rename both libraries.

[aojea]

agree, but I think it didn't merge it, right?

[danwinship]

ah, the existing code uses both libraries in different files, so doesn't have to rename either of them. But that's kind of even worse because it means that netlink. means different things in different files