Clean up shebangs for various files.

- Remove shebangs from:
  - ini files
  - unit tests
  - module_utils
  - plugins
  - module_docs_fragments
  - non-executable Makefiles
- Change non-modules from '/usr/bin/python' to '/usr/bin/env python'.
- Change '/bin/env' to '/usr/bin/env'.

Also removed main functions from unit tests (since they no longer
have a shebang) and fixed a python 3 compatibility issue with
update_bundled.py so it does not need to specify a python 2 shebang.

A script was added to check for unexpected shebangs in files.
This script is run during CI on Shippable.

lib/ansible/module_utils/f5.py

@@ -1,4 +1,3 @@
-#!/usr/bin/python
 # -*- coding: utf-8 -*-
 
 # This code is part of Ansible, but is an independent component.

lib/ansible/module_utils/lxd.py

@@ -1,4 +1,3 @@
-#!/usr/bin/python
 # -*- coding: utf-8 -*-
 
 # (c) 2016, Hiroaki Nakamura <hnakamur@gmail.com>

lib/ansible/module_utils/ovirt.py

@@ -1,4 +1,3 @@
-#!/usr/bin/python
 # -*- coding: utf-8 -*-
 #
 # Copyright (c) 2016 Red Hat, Inc.

lib/ansible/plugins/action/synchronize.py

@@ -1,4 +1,3 @@
-#!/usr/bin/python
 # -*- coding: utf-8 -*-
 
 # (c) 2012-2013, Timothy Appnel <tim@appnel.com>

lib/ansible/utils/module_docs_fragments/azure.py

@@ -1,5 +1,3 @@
-#!/usr/bin/python
-#
 # Copyright (c) 2016 Matt Davis, <mdavis@ansible.com>
 #                    Chris Houseknecht, <house@redhat.com>
 #

lib/ansible/utils/module_docs_fragments/azure_tags.py

@@ -1,5 +1,3 @@
-#!/usr/bin/python
-#
 # Copyright (c) 2016 Matt Davis, <mdavis@ansible.com>
 #                    Chris Houseknecht, <house@redhat.com>
 #

lib/ansible/utils/module_docs_fragments/ovirt.py

@@ -1,4 +1,3 @@
-#!/usr/bin/python
 # -*- coding: utf-8 -*-
 #
 # Copyright (c) 2016 Red Hat, Inc.