Updated openstack/openstack
Project: openstack/python-openstackclient  9b3c84e9e19785dd377ef5c3f754bfddebc75f06

Leverage openstack.common.importutils for import_class

This patch drops the import_utils method from common.utils and leverages
it from openstack.common.importutils instead.

Change-Id: If7e7383aa742afe44f750f916c0d90d747793150
Closes-bug: 1365273