Revert "Delete look_for_expired_device_clients.lua"

This reverts commit 876350cb259625a5b8c5b21da354d84319f9aebe.
Revert "adding script that shows how to parse through a tree at the subdomain level and look for 'expired' device clients and re-enables (regenerates a CIK)."

This reverts commit e6eef873bbbee6b3451415f449016bd495c88bc9.