Title: #5477: DEBUG: Use () in program identifier instead of 
I think the two lines from commit 1823353 also need to be changed.
has been replaced with `SYSLOG_IDENTIFIER=sssd(%s)`. As of now that is the last file in
the diff if sorted alphabetically.
may be retained with square brackets, as it does not relate to [syslog
Would you prefer me to swap `SSSD_PRG_NAME` to be `sssd(%s)` as well in this PR?
See the full comment at https://github.com/SSSD/sssd/pull/5477#issuecomment-769651962