Fix aruba_config flake8 failures (#27603)

* Fix aruba_config flake8 failures

* fix intefaces_file build/flake8 fail

lib/ansible/modules/system/interfaces_file.py

@@ -19,6 +19,9 @@
 # along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
 #
 
+from __future__ import absolute_import, division, print_function
+__metaclass__ = type
+
 ANSIBLE_METADATA = {'metadata_version': '1.0',
                     'status': ['stableinterface'],
                     'supported_by': 'community'}