Updated openstack/openstack
Project: openstack/heat  065de8289c93bf8fbffdee4a6092f8c1c5cb6741

Don't import HeatTestCase directly

Fix the HeatTestCase import issue as required by H302,
a following patch of https://review.openstack.org/#/c/129846/

Change-Id: Iab9a508682e9fe2932b7d00b191c8a4cdea4738b