Fix test tear-down

Author: hazzik

src/NHibernate.Test/Async/NHSpecificTest/GH2454/FixtureByCode.cs

@@ -87,7 +87,9 @@ protected override void OnTearDown()
 			using (var session = OpenSession())
 			using (var transaction = session.BeginTransaction())
 			{
-				session.CreateQuery("delete from System.Object").ExecuteUpdate();
+				session.CreateQuery("delete from Tag").ExecuteUpdate();
+				session.CreateQuery("delete from Component").ExecuteUpdate();
+				session.CreateQuery("delete from Project").ExecuteUpdate();
 				transaction.Commit();
 			}
 		}

src/NHibernate.Test/NHSpecificTest/GH2454/FixtureByCode.cs

@@ -76,7 +76,9 @@ protected override void OnTearDown()
 			using (var session = OpenSession())
 			using (var transaction = session.BeginTransaction())
 			{
-				session.CreateQuery("delete from System.Object").ExecuteUpdate();
+				session.CreateQuery("delete from Tag").ExecuteUpdate();
+				session.CreateQuery("delete from Component").ExecuteUpdate();
+				session.CreateQuery("delete from Project").ExecuteUpdate();
 				transaction.Commit();
 			}
 		}