Use static routes to implement 'host' behavior for non-Linux devices

[ipspace]

Now that we have the generic static routing module and the code to generate the static routes toward the default gateway, we could implement 'role: host' for other devices. The only requirements would be that a device supports the 'routing.static' feature.

To further optimize the static routes, we could have "initial.mgmt_vrf" feature to indicate whether the device uses a management VRF. Such a device needs just a default route not a bunch of routes for pool prefixes.

[jbemmel]

We already have netlab_mgmt_vrf for frr, not exactly a feature but related

[ipspace]

We already have netlab_mgmt_vrf for frr, not exactly a feature but related

That would be a nice way to ensure someone using an old box/container would not complain -- create a bunch of static routes unless the node has netlab_mgmt_vrf set in which case use just a default route.

However, netlab_mgmt_vrf could be defined in a number of places, so it will be fun to figure out its final value.