[SSSD] [sssd PR#678][comment] files: add session recording flag

[jhrozek]

URL: https://github.com/SSSD/sssd/pull/678
Title: #678: files: add session recording flag

jhrozek commented:
"""
ACK. After the change, both a user specified in the session_recording section and a different user who is a member of a group specified in that section report their shell as tlog-rec-session.
"""

See the full comment at https://github.com/SSSD/sssd/pull/678#issuecomment-430197248