Attached is the third version of work-in-progress SSSD/tlog integration
patches. I'm sending them in the hope that somebody takes a look and perhaps
points out some wrong bits I can fix before I'm too dependent on them.
The changes from the last version is some refactoring of the NSS and the
common parts, plus start of the PAM part of the implementation.
Also, at this point, I think I could contribute some general fixes and
prerequisite refactoring patches separately.