Use final release of Fedora 20 for heat test image

The image file has not changed, but the URL now points to
the release directory for Fedora 20.

Change-Id: Ie1a9bcc7da634996b25ef7f6fc694398c632549d
diff --git a/stackrc b/stackrc
index e89e64d..2c770bc 100644
--- a/stackrc
+++ b/stackrc
@@ -283,7 +283,7 @@
 esac
 
 if [[ "$HEAT_FETCHED_TEST_IMAGE" == "Fedora-i386-20-20131211.1-sda" ]]; then
-    IMAGE_URLS+=",https://dl.fedoraproject.org/pub/alt/stage/20-RC1.1/Images/i386/$HEAT_FETCHED_TEST_IMAGE.qcow2"
+    IMAGE_URLS+=",https://dl.fedoraproject.org/pub/fedora/linux/releases/20/Images/i386/$HEAT_FETCHED_TEST_IMAGE.qcow2"
 fi
 
 # 10Gb default volume backing file size