Comment 2 for bug 1665078

Ensuring that netplan parses the while file is not the same as the order in which netplan parses individual configuration files.

If I ship the attached file as the *only* netplan configuration file on the whole system surely I can expect netplan to *parse* the whole file, and then generate a configuration.

I suspect things like bridged vlan bonds is going to have a certain amount of cross referencing that's going to be problematic for single-pass rendering.