Do not vendor cookbooks using Berkshelf anymore

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

cookbooks/redis/files/default/tests/minitest/client_test.rb

@@ -1,7 +0,0 @@
-require_relative "test_helper"
-
-describe_recipe "redis::client" do
-  it "installed the `redis-tools` package" do
-    package("redis-tools").must_be_installed
-  end
-end