Do not vendor cookbooks using Berkshelf anymore

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

cookbooks/redis/spec/default_spec.rb

@@ -1,19 +0,0 @@
-require "spec_helper"
-
-describe "redis::default" do
-  let(:chef_run) do
-    ChefSpec::SoloRunner.new.converge(described_recipe)
-  end
-
-  it { expect(chef_run).to add_apt_repository("chris-lea-redis-server") }
-
-  # debian family setup
-  context "using debian platform" do
-    let(:chef_run) do
-      env_options = { platform: "debian", version: "6.0.5" }
-      ChefSpec::SoloRunner.new(env_options).converge(described_recipe)
-    end
-
-    it { expect(chef_run).to add_apt_repository("dotdeb") }
-  end
-end