Ip address basic support

[yonatan-linik]

No description provided.

[cathay4t]

@yonatan-linik Do you still have interest on continue the work here?

[yonatan-linik]

@yonatan-linik Do you still have interest on continue the work here?

Yes, I waited for the bond support to be merged 🙏

[yonatan-linik]

I removed the flags for controller and port, because it caused local test runs to fail.
I saw the following comment, but I am not sure how else I can get around these failures:

// Compatible with iproute2, but we still append `PORT` after
// iproute2 flags.

[cathay4t]

Let's remove this controller/port stuff now and focus on full compatible.

We can always add iproute-rs --no-compact to introduce fancy own stuff.

[yonatan-linik]

@cathay4t Should be ready for review

[cathay4t]

The patch looks ok, but let me extract some code to netlink-packet-route for Display trait implementation.

This repo should not hold such codes.

[cathay4t]

I have created rust-netlink/netlink-packet-route#256

We only need to handle [RT_SCOPE_UNIVERSE] = "global" here for display.