Add boilerplate to fetch.py

This completes the modules/files directory so we can now check it for
regressions.

lib/ansible/modules/files/fetch.py

@@ -2,6 +2,10 @@
 # Copyright: (c) 2017, Ansible Project
 # GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
 
+from __future__ import absolute_import, division, print_function
+__metaclass__ = type
+
+
 ANSIBLE_METADATA = {'metadata_version': '1.0',
                     'status': ['stableinterface'],
                     'supported_by': 'core'}