Add a "light" base test class for DB tests

This newly added class simply extends DietTestCase
with support for SQL operations.

Related-Blueprint: better-quotas
Change-Id: I2debc6a144ee93155c8e36f06aecb9735dbf55d4

neutron/tests/unit/testlib_api.py

@@ -75,6 +75,14 @@ class SqlFixture(fixtures.Fixture):
         self.addCleanup(clear_tables)
 
 
+class SqlTestCaseLight(base.DietTestCase):
+    """All SQL taste, zero plugin/rpc sugar"""
+
+    def setUp(self):
+        super(SqlTestCaseLight, self).setUp()
+        self.useFixture(SqlFixture())
+
+
 class SqlTestCase(base.BaseTestCase):
 
     def setUp(self):