Quota list API returns project_id

Quota list API returns tenant_id with the project's resource quota
but it doesn't return project_id. When neutron supported keystone v3
feature, it was missed[1]. This patch also removes an useless check
from UT.

[1]: https://review.openstack.org/#/c/357977/

APIImpact

Closes-Bug: #1667827
Change-Id: I78f4aa38a0d775e7600afafdd6941ef485f62ade
diff --git a/neutron/tests/tempest/api/admin/test_quotas.py b/neutron/tests/tempest/api/admin/test_quotas.py
index 9736d7f..20a0cc6 100644
--- a/neutron/tests/tempest/api/admin/test_quotas.py
+++ b/neutron/tests/tempest/api/admin/test_quotas.py
@@ -91,6 +91,7 @@
         found = False
         for qs in non_default_quotas['quotas']:
             if qs['tenant_id'] == tenant_id:
+                self.assertEqual(tenant_id, qs['project_id'])
                 found = True
         self.assertTrue(found)