[MERGE] [FIX] property fields: in _fnct_write call, make sure the removal of older...

This was problematic when the admin or a mutlicompany user in parent company set a value for a property field on any record shared through companies. The change would remove the property already set on child companies instead of only replacing the current value.

The test requires previous revision (rev-id mat@openerp.com-20140213121853-mbbk6pkya92hy4xd) of server to avoid commiting changes in _field_create call.

bzr revid: mat@openerp.com-20140213134838-sia2s9vybq5oep65