Cleanup and updates to physical podconfigs

Change-Id: Iefdb3e39d9aaa1343e40b0b9131d0f0c6b2cadd1
diff --git a/docker_images.yml b/docker_images.yml
index ba36fbe..51693d6 100644
--- a/docker_images.yml
+++ b/docker_images.yml
@@ -1,4 +1,4 @@
-
+---
 # Copyright 2017-present Open Networking Foundation
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -13,8 +13,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-
----
 # docker_images.yml
 # master list of docker images used by imagebuilder.py