Use new image for kitchen tests

Change-Id: I240905ec5e8a725dc5d16865f78bdbce414cfe46
diff --git a/.kitchen.yml b/.kitchen.yml
index 0aef785..3ecefb3 100644
--- a/.kitchen.yml
+++ b/.kitchen.yml
@@ -30,9 +30,9 @@
 
 
 platforms:
-  - name: <%=ENV['PLATFORM'] || 'ubuntu-xenial-2017.7'%>
+  - name: <%=ENV['PLATFORM'] ||  'saltstack-ubuntu-xenial-salt-stable' %>
     driver_config:
-      image: <%=ENV['PLATFORM'] || 'trevorj/salty-whales:xenial-2017.7'%>
+      image: <%=ENV['PLATFORM'] || 'epcim/salt-formulas:saltstack-ubuntu-xenial-salt-stable'%>
       platform: ubuntu
 
 suites: