Comment 1 for bug 1062097

When I modify exception.py, exception.VirtualInterfaceMacAddressException() is occured.

From:
def wrap_db_error(f):
    def _wrap(*args, **kwargs):
        try:
            return f(*args, **kwargs)
        except UnicodeEncodeError:
            raise InvalidUnicodeParameter()
        except Exception, e:
            LOG.exception(_('DB exception wrapped.'))
            raise DBError(e)
    _wrap.func_name = f.func_name
    return _wrap

To:
def wrap_db_error(f):
    def _wrap(*args, **kwargs):
        try:
            return f(*args, **kwargs)
        except UnicodeEncodeError:
            raise InvalidUnicodeParameter()
        except Exception, e:
            LOG.exception(_('DB exception wrapped.'))
            raise e
    _wrap.func_name = f.func_name
    return _wrap

This is error trace when changed code.
Traceback (most recent call last):
  File "./test_create_vif.sh", line 23, in <module>
    main(sys)
  File "./test_create_vif.sh", line 17, in main
    db.virtual_interface_create(context, vif)
  File "/usr/local/lib/python2.7/dist-packages/nova-2012.1-py2.7.egg/nova/db/api.py", line 448, in virtual_interface_create
    return IMPL.virtual_interface_create(context, values)
  File "/usr/local/lib/python2.7/dist-packages/nova-2012.1-py2.7.egg/nova/db/sqlalchemy/api.py", line 120, in wrapper
    return f(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/nova-2012.1-py2.7.egg/nova/db/sqlalchemy/api.py", line 1004, in virtual_interface_create
    raise exception.VirtualInterfaceCreateException()
nova.exception.VirtualInterfaceCreateException: Virtual Interface creation failed