Updated openstack/openstack
Project: openstack/requirements  741bfc42b4cd504b8d83d8a4a6ff59354e000461
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Add sphinxcontrib-docbookrestapi

Ceilometer would like to use this piece of software to generate its
documentation on api-site.openstack.org.

Change-Id: Iaa84962378eb1cee9edaccd1ba50b6ad020e1d2a