Commit 5a400f8011c482abd9c0b550f566bb452159a383 broke the stackrc for
the containerized undercloud, making all the openstack commands fail
with:
Cannot use v2 authentication with domain scope
This replaces the OS_TENANT_NAME variable with OS_PROJECT_NAME to and
switch to versionless auth_url to use keystone v3 instead.
Change-Id: I869adb75294b38c61e508870a69e1637bb410a94
Closes-Bug: #1719796