Optimize kitchen tests for Travis CI

Change-Id: I6aa757a03fb7933d93ef0501a74443d20d644bdc
diff --git a/.travis.yml b/.travis.yml
index bed69f7..3ad76ed 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,17 +17,18 @@
   - bundle install
 
 env:
-  - PLATFORM=trevorj/salty-whales:trusty SUITE=postgresql_server
-  - PLATFORM=trevorj/salty-whales:xenial SUITE=postgresql_server
-  - PLATFORM=trevorj/salty-whales:trusty SUITE=postgresql_client
-  - PLATFORM=trevorj/salty-whales:xenial SUITE=postgresql_client
+  - PLATFORM=trevorj/salty-whales:trusty SUITE=postgresql-server
+  - PLATFORM=trevorj/salty-whales:xenial SUITE=postgresql-server
+  - PLATFORM=trevorj/salty-whales:trusty SUITE=postgresql-client
+  - PLATFORM=trevorj/salty-whales:xenial SUITE=postgresql-client
 
 before_script:
   - set -o pipefail
   - make test | tail
 
 script:
-  - KITCHEN_LOCAL_YAML=.kitchen.travis.yml bundle exec kitchen test -t tests/integration
+  - test ! -e .kitchen.yml || bundle exec kitchen converge ${SUITE} || true
+  - test ! -e .kitchen.yml || bundle exec kitchen verify ${SUITE} -t tests/integration
 
 notifications:
   webhooks: