puppet: Move memcached and rabbitmq include out of app_frontend_base.pp.

puppet/zulip/manifests/app_frontend_base.pp

@@ -1,6 +1,4 @@
 class zulip::app_frontend_base {
-  include zulip::rabbit
-  include zulip::memcached
   include zulip::nginx
   include zulip::supervisor
 

puppet/zulip/manifests/voyager.pp

@@ -3,6 +3,8 @@ class zulip::voyager {
   include zulip::base
   include zulip::app_frontend_base
   include zulip::postgres_appdb_tuned
+  include zulip::memcached
+  include zulip::rabbit
   include zulip::redis
 
   file { "/etc/nginx/sites-available/zulip-enterprise":

puppet/zulip_internal/manifests/app_frontend.pp

@@ -1,5 +1,7 @@
 class zulip_internal::app_frontend {
   include zulip::app_frontend_base
+  include zulip::memcached
+  include zulip::rabbit
   include zulip::postfix_localmail
   $app_packages = [# Needed for minify-js
                    "yui-compressor",