This uncomments the list additions for the lists.airshipit.org and
lists.katacontainers.io sites on the new mailman server, removing
the configuration for them from the lists.opendev.org server and, in
the case of the latter, removing all our configuration management
for the server as it was the only site hosted there.
Change-Id: Ic1c735469583e922313797f709182f960e691efc