Useless IPs reported on instances

#1951 is back.

In multipass list and multipass info we list all the IPs we find on instances. The problem is they may not be reachable outside of the instance (e.g. bridges for containers, guest networks). It's confusing today that you see an IP that you can not reach.

PS C:\Users\natha> multipass list
Name                    State             IPv4             Image
docker-vm               Running           172.17.0.1       Ubuntu 20.04 LTS

PS C:\Users\natha> ssh -v 172.17.0.1
OpenSSH_for_Windows_8.1p1, LibreSSL 3.0.2
debug1: Connecting to 172.17.0.1 [172.17.0.1] port 22.
debug1: connect to address 172.17.0.1 port 22: Connection timed out
ssh: connect to host 172.17.0.1 port 22: Connection timed out

I see two options out of this:

1. only display IPs for interfaces Multipass created (based on their MAC)
2. show interface names as well (to help identify usable networks)

Start with the entry points for multipass list and multipass info, and reproduce the reported unreachable address from the issue. Trace how instance IPs are collected and determine whether the intended behavior is to filter them or show interface names. Done means the command output no longer presents confusing unreachable addresses, with the chosen behavior covered by tests.