Due to various issues with updating the Overcloud heat stack, updates from 7.0 to 7.1 with network isolation would not work. This fix corrects these issues. Now you can update deployments from 7.0 to 7.2 directly. Updates from 7.0 to 7.1 should be skipped. Ensure to to follow the documented update procedure, as additional Heat environment files are needed depending on the configuration of particular deployments.