Use new image for kitchen tests

Change-Id: Ia3fa4df06175b20ecd867a3132314587a5c4c990
diff --git a/.travis.yml b/.travis.yml
index 737c0e1..9e5942f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,8 +17,9 @@
   - bundle install
 
 env:
-  - PLATFORM=trevorj/salty-whales:trusty SUITE=telegraf-agent
-  - PLATFORM=trevorj/salty-whales:xenial SUITE=telegraf-agent
+  - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-xenial-salt-2016.3 SUITE=telegraf-agent
+  - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-xenial-salt-2017.7 SUITE=telegraf-agent
+  # - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-bionic-salt-2017.7 SUITE=telegraf-agent
 
 before_script:
   - set -o pipefail