[manual] Switch over to new /etc/zulip/zulip.conf config file

Run the following commands as root before deploying this branch:
 # /root/zulip/tools/migrate-server-config
 # rm /etc/zulip/machinetype /etc/zulip/server /etc/zulip/local /etc/humbug-machinetype /etc/humbug-server /etc/humbug-local

(imported from commit aa7dcc50d2f4792ce33834f14761e76512fca252)

puppet/zulip-internal/manifests/base.pp

@@ -28,14 +28,6 @@ class zulip-internal::base {
     source     => 'puppet:///modules/zulip-internal/root_authorized_keys',
   }
 
-  # This is just an empty file.  It's used by the app to test if it's running
-  # in production.
-  file { '/etc/zulip/server':
-    ensure     => file,
-    mode       => 644,
-    content    => '',
-  }
-
   file { '/usr/local/sbin/zulip-ec2-configure-interfaces':
     ensure     => file,
     mode       => 755,

puppet/zulip-internal/manifests/init.pp

@@ -1,14 +1,2 @@
-class zulip-internal ($machinetype) {
-  class { "zulip-internal::$machinetype": }
-
-  file { '/etc/zulip/machinetype':
-    ensure  => file,
-    mode    => 644,
-    content => "$machinetype\n",
-  }
-
-  Exec { path => "/usr/sbin:/usr/bin:/sbin:/bin" }
-
-  class {'apt': }
-
+class zulip-internal {
 }

puppet/zulip/manifests/local_server.pp

@@ -38,14 +38,6 @@ class zulip::local_server {
     target => '/home/zulip/deployments/current/prod-static/serve',
   }
 
-  # This is just an empty file.  It's used by the app to test if it's running
-  # on a local server.
-  file { '/etc/zulip/local':
-    ensure     => file,
-    mode       => 644,
-    content    => '',
-  }
-
   file { "/usr/share/postgresql/9.1/tsearch_data/zulip_english.stop":
     require => Package["postgresql-9.1"],
     ensure => file,