puppet: Move zulip_ops::profile::postgres_appdb to postgresql.

docs/production/export-and-import.md

@@ -232,7 +232,7 @@ that they are up to date using the Nagios plugin at:
 Zulip has database configuration for using Postgres streaming
 replication. You can see the configuration in these files:
 
-* `puppet/zulip_ops/manifests/profile/postgres_appdb.pp`
+* `puppet/zulip_ops/manifests/profile/postgresql.pp`
 * `puppet/zulip_ops/files/postgresql/*`
 
 We use this configuration for Zulip Cloud, and it works well in

puppet/zulip/manifests/profile/postgresql.pp

@@ -1,5 +1,4 @@
-# postgres_appdb_tuned extends postgres_appdb_base by automatically
-# generating tuned database configuration.
+# @summary Extends postgresql_base by tuning the configuration.
 class zulip::profile::postgresql {
   include zulip::profile::base
   include zulip::postgresql_base

puppet/zulip_ops/manifests/profile/postgresql.pp

@@ -1,4 +1,4 @@
-class zulip_ops::profile::postgres_appdb {
+class zulip_ops::profile::postgresql {
   include zulip_ops::profile::base
   include zulip::profile::postgresql
   include zulip::postgresql_backups