This change adds a new routes field to the network
definition in network_data.yaml. This field contains
a list of network routes in JSON, e.g.
[{'destination':'10.0.0.0/16','nexthop':'10.0.0.1'}].
This list is used to set the ``host_routes`` property
of each networks subnet.
Co-Authored-By: Dan Sneddon <dsneddon@redhat.com>
Partial: blueprint tripleo-routed-networks-templates
Depends-On: Ifc5aad7a154c33488a7613c8ee038c92ee6cb1a7
Change-Id: I33b34f1445f4203fbf25edeb093b37c7494c664f
