Use new image for kitchen tests

Change-Id: I02c6a71ee05d4b1a8d88be55d03061464d0135fd
diff --git a/.travis.yml b/.travis.yml
index 3e5cda9..1741991 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,8 +17,9 @@
   - bundle install
 
 env:
-    - PLATFORM=trevorj/salty-whales:trusty SUITE=client-single
-    - PLATFORM=trevorj/salty-whales:xenial SUITE=client-single
+    - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-xenial-salt-2016.3 SUITE=client-single
+    - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-xenial-salt-2017.7 SUITE=client-single
+#     - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-bionic-salt-2017.7 SUITE=client-single
 
 before_script:
   - set -o pipefail