Switch test to 2017.7

Change-Id: I99298f2a6b5d794a0ece06746f92eb5d3fd620ba
diff --git a/.kitchen.yml b/.kitchen.yml
index ed53d70..c846164 100644
--- a/.kitchen.yml
+++ b/.kitchen.yml
@@ -29,9 +29,9 @@
   sudo: true
 
 platforms:
-  - name: <%=ENV['PLATFORM'] || 'ubuntu-xenial'%>
+  - name: <%=ENV['PLATFORM'] || 'ubuntu-xenial-2017.7'%>
     driver_config:
-      image: <%=ENV['PLATFORM'] || 'trevorj/salty-whales:xenial'%>
+      image: <%=ENV['PLATFORM'] || 'trevorj/salty-whales:xenial-2017.7'%>
       platform: ubuntu
 
 suites:
diff --git a/.travis.yml b/.travis.yml
index 7ea81dc..b367f1f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,7 +17,7 @@
   - bundle install
 
 env:
-    - PLATFORM=trevorj/salty-whales:xenial SUITE=default
+    - PLATFORM=trevorj/salty-whales:xenial-2017.7 SUITE=default
 
 before_script:
   - set -o pipefail