EULA logic on snapshots changed

We were originally able to get the build listings without doing
EULA stuff. This has changed, so cookie logic being added to core
code to be safe.
diff --git a/build-images.py b/build-images.py
index e7f0006..4a6a176 100755
--- a/build-images.py
+++ b/build-images.py
@@ -253,6 +253,8 @@
     if args.binaries:
         binaries = args.binaries
 
+    crawler.cookie_setup()
+
     dm = fetch_image.DownloadManager(args.out_dir)
 
     if args.release: