Enclosed is the squashed patch.
No worries, re-reading the thread I think I missed a few things early on. You were suggesting adding an attribute to handle an alias on the master map, which is why rfc2307_autofs_mobject_map and rfc2307bis_autofs_entry_map would needed to have been updated(?).
Also, automounter works fine with different master map names, we use it in production without issue at least. It was my understanding that sssd needs to know the master map name so that it can expire it from the cache properly on updates, is that correct? So in sssd.conf you also have ldap_autofs_map_master_name = auto.slave, right?
Thanks again for your patience, much appreciated. ;-)