Add option for nova endpoint type

[OpenStack Infra]

https://review.openstack.org/291810
Dear bug triager. This bug was created since a commit was marked with DOCIMPACT.
Your project "openstack/neutron" is set up so that we directly report the documentation bugs against it. If this needs changing, the docimpact-group option needs to be added for the project. You can ask the OpenStack infra team (#openstack-infra on freenode) for help if you need to.

commit 2be884aefe40faab305c9995dbe853e853cd8bba
Author: Jeremy McDermond <email address hidden>
Date: Tue Dec 8 10:14:09 2015 -0800

    Add option for nova endpoint type

    When the neutron notification to nova was updated to use novaclient the
    nova_url parameter was disabled. This prevents administrators from
    using anything but the publicURL as the proper endpoint to notify nova.
    This patch adds an option to pass on to novaclient for the
    endpoint_type so that the administrator can set the notification url to
    public, internal or admin.

    Change-Id: I405f761944449cab6b8c8895f98419f79cd74cad
    Closes-Bug: #1478471
    DocImpact: Need to add a new option to the neutron configuration
    reference.
    (cherry picked from commit 7dad96deb4ae66509d968465bcd1c852c6743bc1)

[Armando Migliaccio (armando-migliaccio)]

This was triggered because the change was cherry picked to stable...the workflow doesn't seem quite right and probably we should have cherry picked the change in the first place.