As an update to this,
The hostOS field is no longer a part of the Database schema. I’ve already made corrections to the to the auto.register.php file to allow host registration as with SVN r899, it still tries to insert data into the hosts.hostOS table which does not exists. Because it fails, the script keeps attemping in a, seemingly, forever loop, but in actuality you can edit the auto.register.php file while the host is attempting to upload to inventory. Take out the reference of insert into hostOS and the process will complete just fine.