Updates glance fixture for create image

glance client takes image_min_disk as string and return as int,
while glance fixture is returning as it is.

Change-Id: I47df4d147d9dd4c901af2c55c97e111e603cd806

nova/tests/fixtures/glance.py

@@ -300,6 +300,10 @@ class GlanceFixture(fixtures.Fixture):
 
         image_meta = copy.deepcopy(metadata)
 
+        if image_meta.get('min_disk'):
+            # min_disk should be of int type only.
+            image_meta['min_disk'] = int(image_meta['min_disk'])
+
         # Glance sets the size value when an image is created, so we
         # need to do that here to fake things out if it's not provided
         # by the caller. This is needed to avoid a KeyError in the