Use new image for kitchen tests

Change-Id: I79914f8a4bbfc8574f666a29a24931bea062375f
diff --git a/.travis.yml b/.travis.yml
index eb23a1c..696d53f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,8 +17,11 @@
   - bundle install
 
 env:
-    - PLATFORM=trevorj/salty-whales:trusty SUITE=apache-server-php5
-    - PLATFORM=trevorj/salty-whales:xenial SUITE=apache-server-php7
+    - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-trusty-salt-2017.7 SUITE=apache-server-php5
+    - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-trusty-salt-2016.3 SUITE=apache-server-php5
+    - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-xenial-salt-2017.7 SUITE=apache-server-php7
+    - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-xenial-salt-2016.3 SUITE=apache-server-php7
+#    - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-bionic-salt-2017.7 SUITE=apache-server-php7
 
 before_script:
   - set -o pipefail