use kitchen-sync for copying files

.kitchen.yml

@@ -19,6 +19,8 @@ driver:
   disable_upstart: false
   provision_command:
     - echo 'L /run/docker.sock - - - - /docker.sock' > /etc/tmpfiles.d/docker.conf
+transport:
+  name: sftp
 <% end %>
 
 sudo: false

Gemfile

@@ -4,6 +4,7 @@ source 'https://rubygems.org'
 
 gem 'test-kitchen'
 gem 'kitchen-salt', :git => 'https://github.com/saltstack/kitchen-salt.git'
+gem 'kitchen-sync'
 gem 'git'
 
 group :docker do