Add beginning of ConfigureDisks capability to VirtualBox provider

plugins/providers/virtualbox/cap/configure_disks.rb

@@ -0,0 +1,11 @@
+module VagrantPlugins
+  module ProviderVirtualBox
+    module Cap
+      module ConfigureDisks
+        def self.configure_disks(machine, defined_disks)
+          return nil if defined_disks.empty?
+        end
+      end
+    end
+  end
+end

plugins/providers/virtualbox/plugin.rb

@@ -39,6 +39,11 @@ module VagrantPlugins
         Cap::PublicAddress
       end
 
+      provider_capability(:virtualbox, :configure_disks) do
+        require_relative "cap/configure_disks"
+        Cap::ConfigureDisks
+      end
+
       provider_capability(:virtualbox, :snapshot_list) do
         require_relative "cap"
         Cap