_clean() method is renamed to clean() in osprofiler 2.3.0. It was suggested in a past neutronclient review. Closes-Bug: #1783789 Co-Authored-By: Akihiro Motoki <amotoki@gmail.com> Depends-On: https://review.openstack.org/#/c/592018/ Change-Id: Ic8e03db85dc08cfdcac5507e99ecdf7eac8eb972