Depend on nodejs only on local_dev for now.

We need to make sure it's totally drop-in functional on the app servers
before I'd feel comfortable modifying their config.

(imported from commit e42d6e37732d65f827982aabaff9399ec1bda0f2)

servers/puppet/modules/zulip/manifests/local_server.pp

@@ -3,6 +3,9 @@ class zulip::local_server {
   class { 'zulip::app_frontend': }
 
   package { "postgresql-9.1": ensure => installed }
+  # This should be migrated over to app_frontend, once validated as functional
+  # on app servers.
+  package { "nodejs": ensure => installed }
 
   file { "/etc/nginx/sites-available/zulip-local":
     require => Package[nginx],