Vagrant up expects machine data_dir to exist afterwards (#1298)

Ensure the machine data_dir is recreated after removal because vagrant
up expects the directory to exist even if there has been an exception
and the machine has been deleted subsequently.

lib/vagrant-libvirt/action/clean_machine_folder.rb

@@ -19,6 +19,8 @@ module VagrantPlugins
 
           @logger.debug("Recursively removing: #{machine_folder}")
           FileUtils.rm_rf(machine_folder, :secure => true)
+          # need to recreate to prevent exception during a cancelled up
+          FileUtils.mkdir_p(machine_folder)
 
           @app.call(env)
         end