Moving some packages from XMPP to Python team

[Martin <debacle@debian.org>]

Hi,

just FYI: I plan to move some packages from the XMPP to the Python team.
I'm the main uploader, in both teams, and the package will remain
team-maintained, i.e. the change is rather minor.
But the Python team has the better understanding of the Python
ecosystem, which is more important for those packages than protocol
know-how.

The packages are:

 - gajim
 - gajim-antispam
 - gajim-lengthnotifier
 - gajim-openpgp
 - gajim-pgp
 - gajim-triggers
 - libervia-backend
 - libervia-pubsub
 - libervia-templates
 - omemo-dr
 - painintheapt
 - poezio
 - python-nbxmpp
 - python-oldmemo
 - python-twomemo
 - slidge
 - slidge-matridge
 - slixmpp
 - slixmpp-omemo
 - sms4you
 - urwid-satext

Cheers