Comment 7 for bug 1404983

The root cause of this problem is two tempest negative tests
(https://github.com/openstack/tempest/blob/477d63086eac246afed75904918d757ecc1762a4/tempest/api/orchestration/stacks/test_templates_negative.py)

In this tests we try to connect to example.com and fetch some templates.
Sometimes it leads to hanging heat-api service.