Merge pull request #263 from aspiers/extra-storage-cache-mode

allow cache mode to be set for additional disks

lib/vagrant-libvirt/config.rb

@@ -141,6 +141,7 @@ module VagrantPlugins
           :type => options[:type],
           :size => options[:size],
           :path => options[:path],
+          :cache => options[:cache] || 'default',
         }
 
         if storage_type == :file

lib/vagrant-libvirt/templates/domain.xml.erb

@@ -36,7 +36,7 @@
 <%# additional disks -%>
 <% @disks.each do |d| -%>
     <disk type='file' device='disk'>
-      <driver name='qemu' type='<%= d[:type] %>'/>
+      <driver name='qemu' type='<%= d[:type] %>' cache='<%= d[:cache] %>'/>
       <source file='<%= d[:path] %>'/>
       <target dev='<%= d[:device] %>' bus='virtio'/>
 <%# this will get auto generated by libvirt