Move partner_last name to unported due to failed install

```
ERROR openerp_test openerp.sql_db: bad query: ALTER TABLE "res_partner" ALTER COLUMN "lastname" SET NOT NULL

Traceback (most recent call last):
File "openerp/sql_db.py", line 230, in execute
res = self._obj.execute(query, params)
IntegrityError: column "lastname" contains null values
```