sd-device/networkd: unify code to get a socket for issuing netdev ioctls on

As suggested here:

https://github.com/systemd/systemd/pull/4296#issuecomment-251911349

Let's try AF_INET first as socket, but let's fall back to AF_NETLINK, so that
we can use a protocol-independent socket here if possible. This has the benefit
that our code will still work even if AF_INET/AF_INET6 is made unavailable (for
exmple via seccomp), at least on current kernels.

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