fix(controller): do not require slash at the end of the GET /v2/users

Documentation includes sample code for listing all users using API. It
shows `GET /v1/users` endpoint which did not work. API required a slash
character at the end of URL.

Make the slash optional so both, `GET /v1/users` and `GET /v1/users/`
versions will work.

Author: smt116

rootfs/api/tests/test_users.py

@@ -11,7 +11,7 @@ class TestUsers(TestCase):
     fixtures = ['tests.json']
 
     def test_super_user_can_list(self):
-        url = '/v2/users/'
+        url = '/v2/users'
 
         user = User.objects.get(username='autotest')
         token = Token.objects.get(user=user)
@@ -23,7 +23,7 @@ def test_super_user_can_list(self):
         self.assertEqual(len(response.data['results']), 3)
 
     def test_non_super_user_cannot_list(self):
-        url = '/v2/users/'
+        url = '/v2/users'
 
         user = User.objects.get(username='autotest2')
         token = Token.objects.get(user=user)

rootfs/api/urls.py

@@ -103,5 +103,5 @@
     url(r'^certs/?',
         views.CertificateViewSet.as_view({'get': 'list', 'post': 'create'})),
     # list users
-    url(r'^users/', views.UserView.as_view({'get': 'list'})),
+    url(r'^users/?', views.UserView.as_view({'get': 'list'})),
 ]