Updated openstack/openstack
Project: openstack/python-openstackclient  ffe976ce3edf2e4dc5dd50247a182ca690b4fdd9

Use oslo.utils

Module `importutils` from common code was graduated to oslo.utils,
so it would be great if we reuse this library.
Remove unused strutils.py and gettextutils.py

Change-Id: Iaae19fc5018d83103e5f15ff76d6da686bfdf5f8