puppet: Remove misleading motd.

This banner shows on lb1, advertising itself as lb0.  There is no
compelling reason for a custom motd, especially one which needs to
be reconfigured for each host.

puppet/zulip_ops/files/motd.lb0

@@ -1,13 +0,0 @@
-The programs included with the Debian GNU/Linux system are free software;
-the exact distribution terms for each program are described in the
-individual files in /usr/share/doc/*/copyright.
-
-Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
-permitted by applicable law.
-
-You are connected to lb0.zulip.net.
-
-To connect to an app server, you need to run:
-    ssh <servername>.zulip.net
-
-Note the .net, not the .com.

puppet/zulip_ops/manifests/loadbalancer.pp

@@ -13,14 +13,6 @@ class zulip_ops::loadbalancer {
     notify  => Service['nginx'],
   }
 
-  file { '/etc/motd':
-    ensure => file,
-    owner  => 'root',
-    group  => 'root',
-    mode   => '0644',
-    source => 'puppet:///modules/zulip_ops/motd.lb0',
-  }
-
   file { '/etc/nginx/sites-enabled/loadbalancer':
     ensure  => 'link',
     require => Package['nginx-full'],