Enable X11 forwarding in devstack release versions

vagrant/release/devstack/Vagrantfile

@@ -45,6 +45,11 @@ Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
   config.vm.network :forwarded_port, guest: 8001, host: 8001
   config.vm.network :forwarded_port, guest: 4567, host: 4567
 
+  # Enable X11 forwarding so we can interact with GUI applications
+  if ENV['VAGRANT_X11']
+      config.ssh.forward_x11 = true
+  end
+  
   config.vm.synced_folder "#{edx_platform_mount_dir}", "/edx/app/edxapp/edx-platform", :create => true, nfs: true
   config.vm.synced_folder "#{forum_mount_dir}", "/edx/app/forum/cs_comments_service", :create => true, nfs: true
   config.vm.synced_folder "#{ora_mount_dir}", "/edx/app/ora/ora", :create => true, nfs: true