puppet: Move to setup_disks to postgres_common.

The tooling should now be run no matter if the node is a primary or
replica.

puppet/zulip_ops/manifests/postgres_master.pp

@@ -2,11 +2,6 @@ class zulip_ops::postgres_master {
   include zulip_ops::base
   include zulip_ops::postgres_appdb
 
-  $master_packages = [# Packages needed for disk + RAID configuration
-                      'xfsprogs',
-                      ]
-  package { $master_packages: ensure => 'installed' }
-
   file { '/etc/sysctl.d/40-postgresql.conf':
     ensure => file,
     owner  => 'root',
@@ -15,20 +10,6 @@ class zulip_ops::postgres_master {
     source => 'puppet:///modules/zulip_ops/postgresql/40-postgresql.conf.master',
   }
 
-  file { '/root/setup_disks.sh':
-    ensure => file,
-    owner  => 'root',
-    group  => 'root',
-    mode   => '0744',
-    source => 'puppet:///modules/zulip_ops/postgresql/setup_disks.sh',
-  }
-
-  exec { 'setup_disks':
-    command => '/root/setup_disks.sh',
-    require => Package["postgresql-${zulip::base::postgres_version}", 'xfsprogs'],
-    unless  => 'test $(readlink /var/lib/postgresql) = "/srv/postgresql/" -a -d /srv/postgresql',
-  }
-
   # This one will probably fail most of the time
   exec {'give_nagios_user_access':
     # lint:ignore:140chars