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/default_test.rb

@@ -1,19 +0,0 @@
-require_relative "test_helper"
-
-describe_recipe "redis::default" do
-  let(:apt_path) do
-    "/etc/apt/sources.list.d"
-  end
-
-  it "set up an apt repository" do
-    repo = {
-      "debian" => { name: "dotdeb", content: "dotdeb" },
-      "ubuntu" => { name: "chris-lea-redis-server", content: "chris-lea" }
-    }[node["platform"]]
-
-    apt_file = "#{apt_path}/#{repo[:name]}.list"
-
-    file(apt_file).must_exist
-    file(apt_file).must_include repo[:content]
-  end
-end