[SSSD] [PATCH] NSS: Add original homedir to home directory template options

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 A discussion I had today with John Hodrien on IRC today inspired this patch. He has a special case in his environment where home directories received from IRC needed to be modified by adding a static suffix to them. I realized that there could probably be potentially other situations where this would be useful (such as being able to offset the root to somewhere else on slim clients, etc.). The patch was pretty simple and straightforward, so I threw it together and tested it with the override_homedir option.