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.yml

@@ -1,22 +0,0 @@
----
-driver:
-  name: vagrant
-
-provisioner:
-  name: chef_zero
-
-platforms:
-  - name: ubuntu-16.04
-  - name: ubuntu-18.04
-  - name: debian-9
-
-suites:
-  - name: default
-    run_list:
-      - recipe[ipfs::default]
-    attributes:
-  - name: cluster
-    run_list:
-      - recipe[ipfs::cluster]
-      - recipe[ipfs::cluster_service]
-    attributes: