Use new image for kitchen tests

Change-Id: I34565cd9e7f89324a0e9b708148ecfa480918591
diff --git a/.travis.yml b/.travis.yml
index 37c445a..91e0a46 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,9 +17,9 @@
   - bundle install
 
 env:
-    - PLATFORM=trevorj/salty-whales:trusty SUITE=memcached-server
-    - PLATFORM=trevorj/salty-whales:xenial SUITE=memcached-server
-
+    - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-xenial-salt-2016.3 SUITE=memcached-server
+    - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-xenial-salt-2017.7 SUITE=memcached-server
+    # - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-bionic-salt-2017.7 SUITE=memcached-server
 
 before_script:
   - set -o pipefail