Removing py2 support from python-xattr

[Thomas Goirand <zigo@debian.org>]

Hi,

I came across python-xattr, which I know well because it's used in
Swift. I went to investigate it's reverse dependencies, and discovered
that it's py2 version is only used by calendarserver, which itself, is
py2 only upstream, and is full of py2-ism that would need to be fixed
(and the work is really non-trivial and huge).

Since we decided to work on leaf packages only, what to do in this case,
as it doesn't look like calendarserver will be fixed anytime soon? Shall
we wait? For how long? I've of course filed a bug against
calendarserver, but I'm quite sure this wont be enough to get things moving.

Please, let's generalize and see the whole picture. There will be A LOT
more cases like this one, and I don't think that waiting forever will
solve the situation. It is my opinion that we should set a kind of
policy (ie: wait for how long?) and then act...

Cheers,

Thomas Goirand (zigo)