Fix list concatenation of routes in bond-with-vlan
Fix list concatenation of routes in bond-with-vlan

We are passing a list of routes to concatenate. This list
was nested in another list, causing an invalid configuration.

Closes-Bug: #1793838
Change-Id: I7a8bc5d2171905237fe36d5ccad853f838c9bffc

openstack/tripleo-heat-templates,dprince/tripleo-heat-templates,openstack/tripleo-heat-templates,dprince/tripleo-heat-templates