These where system properties that allowed automated config set upload before better options came along. This was pre collection API or other scripts that let you upload a config set. They were probably largely added, like internal zk mode, for the “demo” - a series of commands on the wiki you could run to bring up a working cloud cluster without any other manual steps.
I believe one of them let you specify a directory to upload and the other would look at solr.xml and upload the config sets for all configured cores. I believe this code was rooted in ZkController or maybe ZkContainer initially. I suppose for back compatibility, eventually support was moved to ConfigSetService. If they don't currently work, at some point they must have been broken. They are no longer mentioned in the docs, and the functionality they provided was long ago superseded by more modern options.
