Support SoftLayer disk_capacity configuration

spec/kitchen/driver/vagrant_spec.rb

@@ -901,6 +901,22 @@
 
       before { config[:provider] = "softlayer" }
 
+      it "adds a line for disk_capacity" do
+        config[:customize] = {
+          :disk_capacity => {
+            :"0" => 25,
+            :"2" => 100
+          }
+        }
+        cmd
+
+        expect(vagrantfile).to match(regexify(<<-RUBY.gsub(/^ {8}/, "").chomp))
+          c.vm.provider :softlayer do |p|
+            p.disk_capacity = {:"0"=>25, :"2"=>100}
+          end
+        RUBY
+      end
+
       it "adds a line for each element in :customize" do
         config[:customize] = {
           :a_key => "some value",

templates/Vagrantfile.erb

@@ -77,8 +77,14 @@ Vagrant.configure("2") do |c|
     <% end %>
   <% when "parallels" %>
     p.customize ["set", :id, "--<%= key.to_s.gsub('_', '-') %>", "<%= value %>"]
-  <% when "rackspace", "softlayer" %>
+  <% when "rackspace" %>
     p.<%= key %> = "<%= value%>"
+  <% when "softlayer" %>
+    <% if key == :disk_capacity %>
+    p.<%= key %> = <%= value %>
+    <% else %>
+    p.<%= key %> = "<%= value %>"
+    <% end %>
   <% when "virtualbox" %>
     p.customize ["modifyvm", :id, "--<%= key %>", "<%= value %>"]
   <% when /^vmware_/ %>