Restore PAM user autocreation functionality (#15825) (#15867)
Backport #15825
* Restore PAM user autocreation functionality
PAM autoregistration of users currently fails due to email invalidity.
This PR adds a new setting to PAM to allow an email domain to be set
or just sets the email to the noreply address and if that fails falls
back to uuid@localhost
Fix #15702
Signed-off-by: Andrew Thornton <art27@cantab.net>
* As per KN4CKER
Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: 6543 <6543@obermui.de>