Use new image for kitchen tests

Change-Id: I5d1731f674bbc0418ab20ef83ffe306da14bfcdc
diff --git a/.kitchen.yml b/.kitchen.yml
index 28afa76..85b1fde 100644
--- a/.kitchen.yml
+++ b/.kitchen.yml
@@ -38,9 +38,9 @@
 
 
 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: