Correct policy action for check_endpoint_group test

Currently ``check_endpoint_group`` test is testing the wrong
policy action causing the test to be skipped in the gates [0].
This commit corrects the policy action to what is actually
enforced in the code [1].

[0] http://logs.openstack.org/10/483110/1/check/gate-tempest-dsvm-patrole-member-ubuntu-xenial/f821202/console.html#_2017-07-12_22_43_39_986182
[1] https://github.com/openstack/keystone/blob/a43d5a6893a5753f8567206032e779930ddd4321/keystone/common/policies/endpoint_group.py#L37

Change-Id: I0cb7c513513674de3bddb7595899607780ae45b6
diff --git a/patrole_tempest_plugin/tests/api/identity/v3/test_ep_filter_groups_rbac.py b/patrole_tempest_plugin/tests/api/identity/v3/test_ep_filter_groups_rbac.py
index e7b73b6..00c9f55 100644
--- a/patrole_tempest_plugin/tests/api/identity/v3/test_ep_filter_groups_rbac.py
+++ b/patrole_tempest_plugin/tests/api/identity/v3/test_ep_filter_groups_rbac.py
@@ -73,7 +73,7 @@
 
     @decorators.idempotent_id('5c16368d-1485-4c28-9803-db3fa3510623')
     @rbac_rule_validation.action(service="keystone",
-                                 rule="identity:check_endpoint_group")
+                                 rule="identity:get_endpoint_group")
     def test_check_endpoint_group(self):
         self.rbac_utils.switch_role(self, toggle_rbac_role=True)
         self.endpoint_groups_client.check_endpoint_group(