Ensure v1 'limit' query parameter works correctly.

The tests were present but were not asserting list results.

page_size was overriding the absolute limit so limits were
not working if they were less than the page_size.

Fixes bug 1037233

Change-Id: If102824212e3846bc65d3f7928cf7aa2e48aaa63

glanceclient/v1/images.py

@@ -123,18 +123,20 @@ class ImageManager(base.Manager):
                         structure of an image object
         :rtype: list of :class:`Image`
         """
-        limit = kwargs.get('limit')
+        absolute_limit = kwargs.get('limit')
 
         def paginate(qp, seen=0):
             url = '/v1/images/detail?%s' % urllib.urlencode(qp)
             images = self._list(url, "images")
             for image in images:
                 seen += 1
+                if absolute_limit is not None and seen > absolute_limit:
+                    return
                 yield image
 
             page_size = qp.get('limit')
             if (page_size and len(images) == page_size and
-                    (limit is None or 0 < seen < limit)):
+                    (absolute_limit is None or 0 < seen < absolute_limit)):
                 qp['marker'] = image.id
                 for image in paginate(qp, seen):
                     yield image

tests/v1/test_images.py

@@ -223,8 +223,9 @@ class ImageManagerTest(unittest.TestCase):
         self.assertEqual(images[2].id, 'c')
 
     def test_list_with_limit_less_than_page_size(self):
-        list(self.mgr.list(page_size=20, limit=10))
-        expect = [('GET', '/v1/images/detail?limit=20', {}, None)]
+        results = list(self.mgr.list(page_size=2, limit=1))
+        expect = [('GET', '/v1/images/detail?limit=2', {}, None)]
+        self.assertEqual(1, len(results))
         self.assertEqual(self.api.calls, expect)
 
     def test_list_with_limit_greater_than_page_size(self):