Use new image for kitchen tests

Change-Id: Ifaa562ce55e64a5e07a3bd815bcbef40e0b1b61d
diff --git a/.kitchen.yml b/.kitchen.yml
index a14a20a..4992d02 100644
--- a/.kitchen.yml
+++ b/.kitchen.yml
@@ -40,9 +40,9 @@
   sudo: true
 
 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: