Comment 10 for bug 1629133

Talked to Clarkb on IRC, perhaps we may need to tweak how routes are installed by Neutron when subnetpools are adopted, but I would not hastily rule out any responsibility from Neutron just yet. A build failure example in [2].

[1] http://eavesdrop.openstack.org/irclogs/%23openstack-infra/%23openstack-infra.2016-10-04.log.html#t2016-10-04T00:44:50
[2] http://logs.openstack.org/78/381278/2/check/gate-tempest-dsvm-neutron-multinode-full-ubuntu-xenial/7f82862/console.html#_2016-10-03_21_14_28_763192