"import" property not set in hosting_drush_import, causing site import to fail

When running a drush command such as:

drush @hostmaster hosting-import @site-alias

The expected behavior would be to spawn an import task on the front-end. Instead, an install task is spawned. This is due to a missing property on the node object, which is checked in hosting_site_node_insert() of hosting_site.nodeapi.inc.

Setting the missing property in hosting_drush_import() of hosting.drush.inc fixes this particular issue.