Revert "Check RBAC policy for nested stacks"

This is causing issues with tripleo failures
with ValueError, when trying do stack-preview as
part of policy enforcement for stack DELETE.

This reverts commit a8accbba98b5fc15562864030f49d20570bf8412.

Change-Id: I366316f27f24c650bd435e67dd17abd8676cedf4
Closes-Bug: #1561172
(cherry picked from commit 354f1bcef038340d95f7dc4bc29268c9efed642e)
diff --git a/functional/test_conditional_exposure.py b/functional/test_conditional_exposure.py
index 77159fe..c1175f1 100644
--- a/functional/test_conditional_exposure.py
+++ b/functional/test_conditional_exposure.py
@@ -76,19 +76,6 @@
       ram: 20000
       vcpus: 10
 """
-    fl_tmpl_nested = """
-heat_template_version: 2015-10-15
-resources:
-  not4everyonerg:
-    type: OS::Heat::ResourceGroup
-    properties:
-        count: 1
-        resource_def:
-            type: OS::Nova::Flavor
-            properties:
-              ram: 20000
-              vcpus: 10
-"""
 
     def test_non_admin_forbidden_create_flavors(self):
         """Fail to create Flavor resource w/o admin role.
@@ -108,11 +95,3 @@
         resources = self.client.resource_types.list()
         self.assertNotIn(self.forbidden_resource_type,
                          (r.resource_type for r in resources))
-
-    def test_non_admin_forbidden_create_flavors_nested(self):
-        stack_name = self._stack_rand_name()
-        ex = self.assertRaises(exc.Forbidden,
-                               self.client.stacks.create,
-                               stack_name=stack_name,
-                               template=self.fl_tmpl_nested)
-        self.assertIn(self.forbidden_resource_type, ex.message)