Updated openstack/openstack
Project: openstack/python-novaclient  0379ae813f315f872dae7f6b1217c84653a1aed0
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Generate interfaces reference doc

Add gen_ref in conf.py to generate reference doc to avoid maintaining
these boilerplates.

Change-Id: I6683c41d39685dcb7f7a619a36210a987c9e9825