Routes should be available from interfaces.template

[Mathieu Gagné]

Routes should be made available when generating the interfaces file from interfaces.template.

People overriding interfaces.template might want to inject routes too but they can't. The routes are not injected in the template engine. We should make them available for such use cases.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/115409

[Matt Riedemann (mriedem)]

This seems like a wishlist bug, possibly blueprint w/o a required spec.

[Mathieu Gagné (mgagne)]

Opening a blueprint instead: https://blueprints.launchpad.net/nova/+spec/network-template-routes-injection

[Davanum Srinivas (DIMS) (dims-v)]

https://review.openstack.org/#/c/115409/ has merged.