Do not vendor cookbooks using Berkshelf anymore

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

cookbooks/ipfs/test/integration/default/serverspec/ipfs_spec.rb

@@ -1,24 +0,0 @@
-require 'serverspec'
-
-# Required by serverspec
-set :backend, :exec
-
-describe 'IPFS' do
-  # It is in the PATH
-  describe command('which ipfs') do
-    its(:exit_status) { should eq 0 }
-  end
-
-  it 'is listening on port 4001' do
-    expect(port(4001)).to be_listening
-  end
-
-  it 'is listening on port 8080 (gateway)' do
-    expect(port(8080)).to be_listening
-  end
-
-  it 'has a running service of ipfs' do
-    expect(service('ipfs')).to be_running
-    expect(service('ipfs')).to be_enabled
-  end
-end