Bundle a copy of github.com/nir0s/distro/distro.py

Since the 'platform.dist()' and 'platform.linux_distribution()'
methods will be removed from future versions of python, this
provides an alternative to replace ansibles use of those
methods.

lib/ansible/module_utils/distro.py is a copy of
https://github.com/nir0s/distro/blob/master/distro.py

This module is originally from https://github.com/nir0s/distro
and is license under the Apache License, Version 2.0.

lib/ansible/module_utils/distro/__init__.py

@@ -0,0 +1,47 @@
+# (c) 2018 Toshio Kuratomi <[email protected]>
+#
+# This file is part of Ansible
+#
+# Ansible is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Ansible is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
+
+# Make coding more python3-ish
+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+'''
+Compat distro library.
+'''
+# The following makes it easier for us to script updates of the bundled code
+_BUNDLED_METADATA = {"pypi_name": "distro", "version": "1.3.0"}
+
+# The following additional changes have been made:
+# * The import of argparse has been moved to __main__ (py2.6 compat)
+# * A format string including {} has been changed to {0} (py2.6 compat)
+# * Port two calls from subprocess.check_output to subprocess.Popen().communicate()
+#   (py2.6 compat)
+
+
+import sys
+
+try:
+    import distro as _system_distro
+except ImportError:
+    _system_distro = None
+
+if _system_distro:
+    distro = _system_distro
+else:
+    # Our bundled copy
+    from ansible.module_utils.distro import _distro as distro
+sys.modules['ansible.module_utils.distro'] = distro