Revives the currently unused TerminalServerAdmins group.
Users in this group will eventually have special privileges for session
management. Currently, members of this group will be allowed to
list all sessions with the xrdp-sesadmin command.
Improve the built-in access checks for sesman/sesexec:-
- Group existence is checked for at login-time rather than program
start time
- The name of the group is now included in the message
Also, check for UID == 0 when checking for root, rather than just
checking the name (which might be an alias)
firewave