Remove misleading todo from config.py

This patch set removes a misleading todo from config.py which
suggests that it might be possible to leverage Keystone's
Policy API to derive policy information from remote hosts. But
this is not possible as the Policy API is deprecated [0].

If we want to get policy information from a remote host we will
need to pursue some SSH alternative instead, but this is not
planned anytime soon.

[0] https://docs.openstack.org/releasenotes/keystone/queens.html#deprecation-notes

Change-Id: I8a4da457c2d40ebddbfe5492dc1cbba87288c0da
diff --git a/patrole_tempest_plugin/config.py b/patrole_tempest_plugin/config.py
index 4dc27b9..9eed5ab 100644
--- a/patrole_tempest_plugin/config.py
+++ b/patrole_tempest_plugin/config.py
@@ -27,8 +27,6 @@
     cfg.BoolOpt('enable_rbac',
                 default=True,
                 help="Enables RBAC tests."),
-    # TODO(rb560u): There needs to be support for reading these JSON files from
-    # other hosts. It may be possible to leverage the v3 identity policy API.
     cfg.ListOpt('custom_policy_files',
                 default=['/etc/%s/policy.json'],
                 help="""List of the paths to search for policy files. Each