Comment 4 for bug 1577100

Reviewed: https://review.openstack.org/315264
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=c98c866e8c9e0c136791832bb32e28623aee5ea5
Submitter: Jenkins
Branch: stable/mitaka

commit c98c866e8c9e0c136791832bb32e28623aee5ea5
Author: Kevin Benton <email address hidden>
Date: Fri Apr 29 23:24:34 2016 -0700

    Fix update target tenant RBAC external path

    This fixes the logic to allow updates to wildcard RBAC external
    policies. It was broken for two reasons: first, it was using the
    wrong kwarg, second, it wasn't considering the target tenant when
    determining if the policy was required.

    This patch fixes both issues and adds an API test exercising the
    update path.

    Closes-Bug: #1577100
    Change-Id: Id7441ab5c3f3667aa1cc48100286a2a9d480e201
    (cherry picked from commit 89297919a73c1e7f86c61d08f3f3d15278f5763a)