Use python3 interpreter by default

This may ease development, because development environment will
be probably already on python3.

Signed-off-by: Jaroslav Škarvada <jskarvad@redhat.com>

experiments/kwin-stop/xlib-example.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python -Es
+#!/usr/bin/python3 -Es
 
 from __future__ import print_function
 import os

experiments/powertop2tuned.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python -Es
+#!/usr/bin/python3 -Es
 # -*- coding: utf-8 -*-
 #
 # Copyright (C) 2008-2013 Red Hat, Inc.

libexec/defirqaffinity.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 
 # Helper script for realtime profiles provided by RT
 

libexec/pmqos-static.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 #
 # pmqos-static.py: Simple daemon for setting static PM QoS values. It is a part
 #                  of 'tuned' and it should not be called manually.

systemtap/varnetload

@@ -1,4 +1,4 @@
-#!/usr/bin/python -Es
+#!/usr/bin/python3 -Es
 #
 # varnetload: A python script to create reproducable sustained network traffic
 

tuned-adm.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python -Es
+#!/usr/bin/python3 -Es
 #
 # tuned: daemon for monitoring and adaptive tuning of system devices
 #

tuned-gui.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # Copyright (C) 2014 Red Hat, Inc.

tuned.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python -Es
+#!/usr/bin/python3 -Es
 #
 # tuned: daemon for monitoring and adaptive tuning of system devices
 #