nose: clean up, support Python 3.10. (#8825)

Due to changes in setuptools, we need to run 2to3 ourselves.
While we're at it, lets apply relevant patches from Debian.

https://salsa.debian.org/python-team/packages/nose/

dev-python/nose/patches/debian/no-google-analytics.diff

@@ -0,0 +1,31 @@
+From: Stefano Rivera <stefanor@debian.org>
+Date: Thu, 8 Oct 2015 10:01:58 -0700
+Subject: Remove Google Analytics tracking JS
+
+Forwarded: not-needed
+Last-Update: 2013-03-04
+---
+ doc/.templates/layout.html | 13 -------------
+ 1 file changed, 13 deletions(-)
+
+diff --git a/doc/.templates/layout.html b/doc/.templates/layout.html
+index 2d961b0..4237ef7 100644
+--- a/doc/.templates/layout.html
++++ b/doc/.templates/layout.html
+@@ -3,16 +3,3 @@
+ {%- block relbar1 %}
+ {% if pagename != 'index' %}{{ super() }}{% endif %}
+ {% endblock %}
+-
+-{%- block footer %}
+-{{ super() }}
+-{% if not embedded %}
+-<script src="http://www.google-analytics.com/urchin.js" 
+-        type="text/javascript">
+-</script>
+-<script type="text/javascript">
+-  _uacct = "UA-2236166-1";
+-  urchinTracker();
+-</script>
+-{% endif %}
+-{%- endblock %}