Allow arbitrary per-connection network settings, such as static routes
or a firewalld zone, to be specified as semicolon-delimited key=value
pairs on a net.*.extra_settings attribute. The keys are passed through
to the network backend of the deployed OS in its native syntax: nmcli
properties on NetworkManager systems, netplan YAML paths on netplan
systems, and ifcfg variables on wicked systems.
Markus Hilger
2f006e507f