Fix GCE driver tests failure which were failing because of the new
``extra`` attribute which was added to the base ``NodeLocation`` class.
@@ -1630,7 +1630,7 @@ class GCEZone(NodeLocation):
self.extra = extra
country = name.split('-')[0]
super(GCEZone, self).__init__(id=str(id), name=name, country=country,
- driver=driver)
+ driver=driver, extra=extra)
@property
def time_until_mw(self):
