Use new image for kitchen tests

Change-Id: I7b46e13e9a74eea1abd84caa7e2c225d681338d2
diff --git a/.kitchen.yml b/.kitchen.yml
index 1342bad..4da5252 100644
--- a/.kitchen.yml
+++ b/.kitchen.yml
@@ -37,9 +37,9 @@
   sudo: true
 
 platforms:
-  - name: <%=ENV['PLATFORM'] || 'ubuntu-xenial'%>
+  - name: <%=ENV['PLATFORM'] ||  'saltstack-ubuntu-xenial-salt-stable' %>
     driver_config:
-      image: <%=ENV['PLATFORM'] || 'trevorj/salty-whales:xenial'%>
+      image: <%=ENV['PLATFORM'] || 'epcim/salt-formulas:saltstack-ubuntu-xenial-salt-stable'%>
       platform: ubuntu
 
 suites: