python3: fix some more shebangs

contrib/boobank_indicator/boobank_indicator/boobank_indicator.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import logging
 import os

contrib/downloadboob/downloadboob.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
 # Copyright(C) 2012 Alexandre Flament

contrib/hds/export.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
 # Copyright(C) 2011 Romain Bignon

contrib/munin/boobank-munin

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 # vim: ft=python et softtabstop=4 cinoptions=4 shiftwidth=4 ts=4 ai
 

contrib/munin/weboob-generic

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 # vim: ft=python et softtabstop=4 cinoptions=4 shiftwidth=4 ts=4 ai
 

contrib/rboorrent-download/rboorrent-download.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
 # Copyright(C) 2017 Matthieu Weber

contrib/videoob_web/videoob-webserver

-#!/usr/bin/env python
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 # vim: ft=python et softtabstop=4 cinoptions=4 shiftwidth=4 ts=4 ai
 

docs/source/genapi.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import os
 

tools/boilerplate/boilerplate.py

-#! /usr/bin/env python
+#! /usr/bin/env python3
 # -*- coding: utf-8 -*-
 
 # Copyright(C) 2013-2019      Laurent Bachelier, Sébastien Jean

tools/boilerplate/boilerplate_data/recipes.py

-#! /usr/bin/env python
 # -*- coding: utf-8 -*-
 
 # Copyright(C) 2013-2019      Laurent Bachelier, Sébastien Jean

tools/boilerplate/recipe.py

-#! /usr/bin/env python
 # -*- coding: utf-8 -*-
 
 # Copyright(C) 2013-2019      Laurent Bachelier, Sébastien Jean