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
1 file changed
tree: 347258c7085811ab868b0f5ac6e6cb0e0895ae45
  1. neutron/