Fix ISO url in test_usage.py (#9739)

Author: weizhouapache

test/integration/smoke/test_usage.py

@@ -95,7 +95,7 @@ def __init__(self):
             "iso": {
                 "displaytext": "Test ISO",
                 "name": "Test ISO",
-                "url": "http://people.apache.org/~tsp/dummy.iso",
+                "url": "http://download.cloudstack.org/testing/marvin/dummy.iso",
                 # Source URL where ISO is located
                 "isextractable": True,
                 "isfeatured": True,