Lose the timestamp in the database, easier not to have it

Change-Id: Ia3804f36de28333177b4d3c992347678d7fa9f57
diff --git a/db/setup_db.py b/db/setup_db.py
index 6f165c8..82ced99 100644
--- a/db/setup_db.py
+++ b/db/setup_db.py
@@ -41,7 +41,7 @@
             "is_trunk BOOLEAN, base_vlan_id INTEGER,"
             "current_vlan_id INTEGER)")
 cur.execute("CREATE TABLE vlan (vlan_id SERIAL, name VARCHAR(32),"
-            "tag INTEGER, is_base_vlan BOOLEAN, creation_time TIMESTAMPTZ)")
+            "tag INTEGER, is_base_vlan BOOLEAN, creation_time TIMESTAMP)")
 
 cur.execute("COMMIT;")