Do not vendor cookbooks using Berkshelf anymore

Instead, use the Berkshelf support in knife-solo and the
vagrant-berkshelf plugin on Vagrant

cookbooks/redis/.kitchen.yml

@@ -1,20 +0,0 @@
-driver:
-  require_chef_omnibus: <%= ENV.fetch("CHEF_VERSION", "latest") %>
-  ssh_key: <%= File.expand_path("./test/support/keys/vagrant") %>
-  name: vagrant
-
-provisioner:
-  name: chef_solo
-
-platforms:
-  - name: debian-6.0.8
-  - name: debian-7.2.0
-  - name: ubuntu-12.04
-  - name: ubuntu-14.04
-
-suites:
-  - name: default
-    run_list:
-      - recipe[redis::server]
-      - recipe[redis::client]
-      # - recipe[minitest-handler]