Here is the second version of RFC for SSSD/tlog integration. This one covers
support for all necessary NSS requests: getpwnam, getpwuid and getpwent.
I don't think it handles caching well, is probably not very fast, has little
tests, and still tries to document code, apart from likely being wrong in many
parts otherwise, but I would like to show it to you, so you can correct me
earlier rather than later.
I'll proceed to the PAM part and adding more tests in the meantime.