Overriden Provision_Service_remote_import_hostmaster methods incompatible with parent

These warnings show up three (3) times on verifying a Remote Import server:

• Declaration of Provision_Service_remote_import_hostmaster::fetch_site($site) should be compatible with Provision_Service_remote_import::fetch_site() hostmaster.php:222
• Declaration of Provision_Service_remote_import_hostmaster::fetch($path, $dest) should be compatible with Provision_Service::fetch($path = NULL) hostmaster.php:222

Not sure if it affects anything yet.