Use new image for kitchen tests

Change-Id: I45f03ae8e550b5eac35cb87d688895c7d5803aa0
diff --git a/.travis.yml b/.travis.yml
index 14c4efc..9172738 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,8 +17,9 @@
   - bundle install
 
 env:
-  - PLATFORM=trevorj/salty-whales:trusty SUITE=client
-  - PLATFORM=trevorj/salty-whales:xenial SUITE=client
+  - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-xenial-salt-2016.3 SUITE=client
+  - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-xenial-salt-2017.7 SUITE=client
+  # - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-bionic-salt-2017.7 SUITE=client
 
 before_script:
   - set -o pipefail