Be more explicit about using python3 to run tools/

We have python scripts in the tools/ dir the vast majority of which we
run regularly with python3 via our python3 default basepython in tox.
However, most of these use a `python` shebang line which can be
confusing as to whether or not these scripts run under python3 or not.

To make this more clear set them to python3. I've confirmed the scripts
running under tox are happy with these changes. For the ones that don't
run under tox I've done a quick review and they look happy too.

Change-Id: I983d23c33f7780e5708aa728c829c3262fc99ea0

tools/add-projects-to-main.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright 2017 Red Hat, Inc.
 #

tools/batch_update_projects.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. You may obtain

tools/check_gerrit_projects_changed.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Check that gerrit/projects.yaml changes are valid.
 #

tools/check_gerrit_projects_changed.sh

@@ -13,7 +13,7 @@ cp gerrit/projects.yaml gerrit/projects-old.yaml
 # check_gerrit_projects_changed.py invocation might be an old version.
 git checkout $GITHEAD
 
-python tools/check_gerrit_projects_changed.py gerrit/projects-old.yaml \
+python3 tools/check_gerrit_projects_changed.py gerrit/projects-old.yaml \
     gerrit/projects.yaml
 
 rm gerrit/projects-old.yaml

tools/check_irc_access.py

@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#! /usr/bin/env python3
 
 # Copyright 2011, 2013-2014 OpenStack Foundation
 # Copyright 2012 Hewlett-Packard Development Company, L.P.

tools/check_valid_gerrit_projects.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Check that gerrit/projects.yaml contains valid entries.
 #

tools/ci2project.py

@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#! /usr/bin/env python3
 
 # Copyright 2014 OpenStack Foundation
 #

tools/fix-neutron-stadium.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright 2017 Red Hat, Inc.
 #

tools/irc_tests.py

@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#! /usr/bin/env python3
 
 # Copyright 2015 SUSE Linux GmbH
 #

tools/normalize_acl.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. You may obtain
 #  a copy of the License at

tools/normalize_channels_yaml.py

@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#! /usr/bin/env python3
 #
 # Copyright (c) 2015 Hewlett-Packard Development Company, L.P.
 #

tools/normalize_projects_yaml.py

@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#! /usr/bin/env python3
 #
 # Copyright (c) 2015 Hewlett-Packard Development Company, L.P.
 #

tools/zuul-projects-checks.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright 2017 SUSE Linux GmbH
 #