Mailing list migration procedures

[Jon Stanley]

I'd like some mailman experts (if we have any) to take a look at this
procedure to migrate lists from redhat.com to lists.fp.o and let me
know if there's something obviously missing from it or if there's some
way that it can be improved. Feel free to make any edits you deem
necessary.

https://fedoraproject.org/wiki/Mailman_Infrastructure_SOP#Mailman_migration