puppet: Remove configuration for old zulip.com bots host.

This configuration didn't do anything anyway and just clutters the
repo.

puppet/zulip_ops/files/nagios3/conf.d/hosts.cfg

@@ -54,14 +54,6 @@ define host{
        hostgroups       all,zmirror
        }
 
-define host{
-       use              generic-host
-       host_name        bots
-       alias            bots
-       address          bots.zulip.net
-       hostgroups       all,not_pageable_servers
-       }
-
 define host{
        use              generic-host
        host_name        postgres1

puppet/zulip_ops/manifests/bots.pp

@@ -1,9 +0,0 @@
-class zulip_ops::bots {
-  include zulip_ops::base
-  include zulip::supervisor
-
-  file { '/etc/supervisor/conf.d/feedback-bot.conf':
-    ensure => absent,
-  }
-
-}