fixes #15014 - pulp db migration on mongo start

This means that every time mongo database is started by puppet, we'll
run pulp-manage-db.  This fixes reset, so when puppet starts mongo
during the puppet run we'll migrate the db.

manifests/database.pp

@@ -23,7 +23,7 @@
     logoutput   => 'on_failure',
     user        => 'apache',
     refreshonly => true,
-    require     => File['/etc/pulp/server.conf'],
+    subscribe   => Service['mongodb'],
   }
 
   Class['pulp::install'] ~> Exec['migrate_pulp_db'] ~> Class['pulp::service']