Switch from IPFS cluster to kredits-ipfs-pinner

This removes the cluster configuration and adds deployment of Kredits
IPFS Pinner. It also switches hubot-kredits to use the normal API
endpoint again (instead of the cluster port).

Furthermore, it upgrades go-ipfs to the latest version.

roles/ipfs_cluster_with_tls.rb

@@ -1,15 +0,0 @@
-name "ipfs_cluster_with_tls"
-
-run_list %w(
-  kosmos-ipfs
-  kosmos-ipfs::cluster
-  kosmos-ipfs::letsencrypt
-)
-
-override_attributes(
-  'kosmos-ipfs' => {
-    'nginx' => {
-      'api_port' => 9095
-    }
-  }
-)