move tox jobs and I18n tools to Python3

Change-Id: I53f840e6c5e5d6656255c76f14fb5b5bf08e57f3

tools/build-docs.sh

@@ -56,7 +56,7 @@ EOF
         echo -n "| " >> $LANG_INDEX
         HAS_LANG=1
         get_lang_name_prog=$(dirname $0)/get-lang-display-name.py
-        name=`python $get_lang_name_prog $language`
+        name=`python3 $get_lang_name_prog $language`
         echo "\`$name <__BASE__/${language}/__INDEX__>\`__" >> $LANG_INDEX
     done
 

tools/check-zanata-users-list.sh

@@ -19,7 +19,7 @@ fi
 TMPFILE=`mktemp`
 trap "rm -f $TMPFILE" EXIT
 
-python tools/zanata/zanata_users.py --output-file $TMPFILE
+python3 tools/zanata/zanata_users.py --output-file $TMPFILE
 if ! diff -u $TEAM_LIST $TMPFILE; then
     set -x
     cat <<EOF

tools/zanata/zanata_stats.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.

tools/zanata/zanata_userinfo.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.

tools/zanata/zanata_users.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.

tox.ini

@@ -4,6 +4,7 @@ envlist = docs,pep8
 skipsdist = True
 
 [testenv]
+basepython=python3
 install_command = pip install -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt} {opts} {packages}
 usedevelop = True
 setenv = VIRTUAL_ENV={envdir}
@@ -62,7 +63,6 @@ max-line-length = 80
 ignore = D000
 
 [testenv:lower-constraints]
-basepython = python3
 deps =
   -c{toxinidir}/lower-constraints.txt
   -r{toxinidir}/test-requirements.txt