Python 2.7 removal outline

[Matthias Andree]

Am 24.03.21 um 22:50 schrieb Dan Mahoney (Ports):

> There are packages for mailman3 but they’re incomplete and don’t
result in a working install the way the 2.x build does.  You also need
mysql, django, etc etc.

Dan, please check if we already have bug reports on the mailman 3 issues
and where they are missing, file new bug reports as needed, to make this
visible. https://bugs.freebsd.org/