Comment 2 for bug 1231704

After asking Eugene, the leader of LBaaS subteam, I understand no session_persistence is also valid and it means there is actually no session persistence.

Horizon need to deal with the case where session_persistence does not exists in a response from Neutron.

Note that it is an undocumented behavior and i filed a bug in netconn-api.
https://bugs.launchpad.net/openstack-api-site/+bug/1231905