Fix missing import and boilerplate

Added fix for missing imports and boilerplate in files modules,
also, removed get_exception calls to match 2.6> exception handling.

Signed-off-by: Abhijeet Kasurde <akasurde@redhat.com>

lib/ansible/modules/files/xattr.py

@@ -1,18 +1,9 @@
 #!/usr/bin/python
-# 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/>.
+# 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'],
@@ -95,6 +86,7 @@ import os
 from ansible.module_utils.basic import AnsibleModule
 from ansible.module_utils.pycompat24 import get_exception
 
+
 def get_xattr_keys(module,path,follow):
     cmd = [ module.get_bin_path('getfattr', True) ]
     # prevents warning and not sure why it's not default