Remove string from URL in list_revoke_events()

The extra string is causing the self URL to be
"/OS-REVOKE/events/events" instead of just
"OS-REVOKE/events".

Change-Id: I3b4e53ffabee5156b2b82b5831cfe23e98527a3a
Closes-Bug: 1384457

keystone/contrib/revoke/controllers.py

@@ -38,7 +38,7 @@ class RevokeController(controller.V3Controller):
                         'next': None,
                         'self': RevokeController.base_url(
                             context,
-                            path=context['path']) + '/events',
+                            path=context['path']),
                         'previous': None}
                     }
         return response

keystone/tests/test_v3_os_revoke.py

@@ -15,6 +15,7 @@ import uuid
 
 from oslo.utils import timeutils
 import six
+from testtools import matchers
 
 from keystone.common import dependency
 from keystone.contrib.revoke import model
@@ -66,6 +67,12 @@ class OSRevokeTests(test_v3.RestfulTestCase, test_v3.JsonHomeTestMixin):
         del (event['issued_before'])
         self.assertEqual(sample, event)
 
+    def test_revoked_list_self_url(self):
+        revoked_list_url = '/OS-REVOKE/events'
+        resp = self.get(revoked_list_url)
+        links = resp.json_body['links']
+        self.assertThat(links['self'], matchers.EndsWith(revoked_list_url))
+
     def test_revoked_token_in_list(self):
         user_id = uuid.uuid4().hex
         expires_at = provider.default_expire_time()