Do not vendor cookbooks using Berkshelf anymore

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

cookbooks/ipfs/.kitchen.dokken.yml

@@ -1,40 +0,0 @@
----
-driver:
-  name: dokken
-  privileged: true # because Docker and SystemD/Upstart
-  chef_version: <%= ENV['CHEF_VERSION'] || 'current' %>
-
-transport:
-  name: dokken
-
-provisioner:
-  name: dokken
-  deprecations_as_errors: true
-
-verifier:
-  name: inspec
-
-platforms:
-  - name: ubuntu-16.04
-    driver:
-      image: dokken/ubuntu-16.04
-      pid_one_command: /bin/systemd
-  - name: ubuntu-18.04
-    driver:
-      image: dokken/ubuntu-18.04
-      pid_one_command: /bin/systemd
-  - name: debian-9
-    driver:
-      image: dokken/debian-9
-      pid_one_command: /bin/systemd
-
-suites:
-  - name: default
-    run_list:
-      - recipe[ipfs::default]
-    attributes:
-  - name: cluster
-    run_list:
-      - recipe[ipfs::cluster]
-      - recipe[ipfs::cluster_service]
-    attributes: