Any import of middleware emits DeprecationWarning

[Henry Gessau]

For example, neutron's test logs are filled with:

2016-10-02 06:51:44.072206 | /home/jenkins/workspace/gate-neutron-python27-ubuntu-xenial/.tox/py27/local/lib/python2.7/site-packages/oslo_middleware/ssl.py:28: DeprecationWarning: The 'oslo_middleware.ssl' module usage is deprecated, please use oslo_middleware.http_proxy_to_wsgi instead
2016-10-02 06:51:44.072236 | "oslo_middleware.http_proxy_to_wsgi")

Neutron is not making any attempt to use oslo_middleware.ssl

The warning is due to the import of ssl.SSLMiddleware from __init__:

  File "neutron/tests/unit/api/v2/test_base.py", line 32, in <module>
    from neutron.api import api_common
  File "neutron/api/api_common.py", line 30, in <module>
    from neutron import wsgi
  File "neutron/wsgi.py", line 42, in <module>
    from neutron.common import config
  File "neutron/common/config.py", line 28, in <module>
    from oslo_middleware import cors
  File ".tox/py27/local/lib/python2.7/site-packages/oslo_middleware/__init__.py", line 31, in <module>
    from oslo_middleware.ssl import SSLMiddleware
  File ".tox/py27/local/lib/python2.7/site-packages/oslo_middleware/ssl.py", line 28, in <module>
    "oslo_middleware.http_proxy_to_wsgi")

[Henry Gessau (gessau)]

https://review.openstack.org/380839

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/oslo.middleware 3.20.0 release.