Update the user management app API tests to test for fail and success scenarios

based on permissions and access. The tests were also updated to comform
with the new API test class interface.

Signed-off-by: Michael Price <loneviking72@gmail.com>

mayan/apps/rest_api/tests/base.py

@@ -57,6 +57,7 @@ class BaseAPITestCase(UserMixin, APITestCase):
 
         self.assertTrue(logged_in)
         self.assertTrue(user.is_authenticated)
+        return user.is_authenticated
 
     def login_user(self):
         self.login(username=TEST_USER_USERNAME, password=TEST_USER_PASSWORD)