1. The chmod 400 with the preset cookie prevented restarts, as
on the second boot it would fail to write to the cookie. Oops.
2. As far as I can tell, sasl logs were disabled because of the
following error:
{error,{cannot_log_to_tty,sasl_report_tty_h,not_installed}}
Not because we actually wanted to disable them. This meant the
management plugin wasn't usable due to a bug set to be fixed in
3.7.0.