When using user-switching in a single process, we must be
careful to not inadvertantly create new Msgmap sqlite3 files.
We must also ensure we set proper permissions on any files
we create.
Additionally, our refactoring was broken as we failed to
actually daemonize or preserve the parent FD in a worker
process.
Finally, default to one worker process since our code may
be fatally broken and it's nice to be able to scale to multiple
cores via SIGTTIN if needed.