Use new image for kitchen tests

Change-Id: I53f77c0f8b74f4b0ad87277abfa37f0604c9fe27
diff --git a/.kitchen.yml b/.kitchen.yml
index bdbd54e..43f469c 100644
--- a/.kitchen.yml
+++ b/.kitchen.yml
@@ -46,9 +46,9 @@
   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: