networkd: more flexible config, allows multiple/routed networks

networkd/defaults/main.yml

networkd/tasks/bond.yml

networkd/tasks/main.yml

networkd/tasks/vlan.yml

networkd/templates/20-wired-bond.network.j2

networkd/templates/20-wired-dhcp.network.j2

networkd/templates/20-wired-routed.network.j2

networkd/templates/20-wired-static.network.j2

networkd/templates/20-wired-vlan.network.j2

networkd/templates/bond.netdev.j2

networkd/templates/bond.network.j2

networkd/templates/bridge.network.j2

networkd/templates/vlan.network.j2