Move wormhole from barnard to nodejs-2

Fixed two small bugs in the recipe:

* hubot user wasn't created when necessary
* systemd template always included redis service dependency

site-cookbooks/kosmos-hubot/templates/default/nodejs.systemd.service.erb

@@ -1,7 +1,9 @@
 [Unit]
 Description=Start nodejs app
+<% unless @without_redis %>
 Requires=redis-server.service
 After=redis-server.service
+<% end %>
 
 [Service]
 ExecStart=<%= @entry %>