Move block data files to CIFS share

This is the vast majority of disk space used on the host currently.

site-cookbooks/kosmos-bitcoin/recipes/blocksdir-mount.rb

@@ -3,8 +3,6 @@
 # Recipe:: blocksdir-mount
 #
 
-apt_package "cifs-utils"
-
 include_recipe 'kosmos-bitcoin::user'
 
 bitcoin_user      = node['bitcoin']['username']
@@ -22,6 +20,8 @@ end
 
 case node["bitcoin"]["blocksdir_mount_type"]
 when "cifs"
+  apt_package "cifs-utils"
+
   systemd_unit "mnt-data-blocks.mount" do
     content({
       Unit: {