The recent patch that adds a neutron subnet lookup using the user
context is not honoring the interface/endpoint_type or region_name
settings for neutron in the octavia configuration file.
This is causing problems for deployments that use the "internal"
endpoint for neutron and the current code will always return
the "public" endpoint.
This patch corrects this problem by including those filter
parameters when the neutron endpoint is looked up in keystone.
(cherry picked from commit 40731e572f2b503a3ccc603642a3721a5ce1cf7a)