ask: stream db backup

Despite be deprecated, the ask server is our 3rd biggest backup.  Even
though the site is R/O we're still backing up the fresh rotations of
the gzipped backups every day.

To reduce the incremental space requirements, move to our plain-text
streaming for the db backup.  This just needs a file dropped in /etc;
see the backup-borg role README documentation.  We do this in puppet
to avoid complexity adding this deprecated service to ansible.  This
then excludes the on-disk db backup dir.

Drop the bup backups while we are here.

Change-Id: Icfd81aca58b9a0dc3a3b74de04c1b00f03160327

inventory/service/group_vars/ask.yaml

@@ -1,2 +1,5 @@
 extra_users:
   - mkiss
+borg_backup_excludes:
+  # backed up via streaming
+  - /var/backups/pgsql_backups

modules/openstack_project/manifests/ask.pp

@@ -103,6 +103,23 @@ class openstack_project::ask (
     password => postgresql_password($db_user, $db_password),
   }
 
+  # Streaming backup of db; see borg-backup role
+  file { '/etc/borg-streams':
+    ensure  => directory,
+    owner   => 'root',
+    group   => 'root',
+    mode    => '0755',
+  }
+
+  file { '/etc/borg-streams/pgsql':
+    ensure  => file,
+    owner   => 'root',
+    group   => 'root',
+    mode    => '0755',
+    content => '/usr/bin/pg_dump -h localhost -U ask -p 5432 askbotdb',
+    require => File['/etc/borg-streams'],
+  }
+
   # redis cache
   class { 'redis':
     redis_port       => $redis_port,
@@ -171,12 +188,6 @@ class openstack_project::ask (
     num_backups       => '10',
   }
 
-  include bup
-  bup::site { 'ord.rax':
-    backup_user   => 'bup-ask01',
-    backup_server => 'backup01.ord.rax.ci.openstack.org',
-  }
-
   class { '::httpd::logrotate':
     options => [
       'daily',