Michael Vogt 42f913abf3 networkd: report per-interface addresses as io.systemd.Network.Address
The networkd metrics interface already reports a lot of interesting
metrics. With this commit it also report the network addresses too.

Each ready address is emitted as one record per (interface, address)
pair:
- object: ifname
- value:  address in CIDR notation
- fields: { family: "ipv4"|"ipv6", scope: "global"|"link"|"host"|... }

The loopback addresses are not reported as its just noise.

Example output:
```
root@localhost:~# varlinkctl --more --json=short call /run/systemd/report/io.systemd.Network io.systemd.Metrics.List '{}'
{"name":"io.systemd.Network.Address","object":"enp0s1","value":"fe80::5054:ff:fe12:3456/64","fields":{"family":"ipv6","scope":"link"}}
{"name":"io.systemd.Network.Address","object":"enp0s1","value":"fec0::5054:ff:fe12:3456/64","fields":{"family":"ipv6","scope":"site"}}
{"name":"io.systemd.Network.Address","object":"enp0s1","value":"10.0.2.15/24","fields":{"family":"ipv4","scope":"global"}}
```
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