Updated from generate-devstack-plugins-list

Change-Id: Iae7700901060efa7687138dc6adf93604afa3ef6

Author: OpenStack Proposal Bot

doc/source/plugin-registry.rst

@@ -65,6 +65,7 @@ freezer-web-ui                         `git://git.openstack.org/openstack/freeze
 gce-api                                `git://git.openstack.org/openstack/gce-api <https://git.openstack.org/cgit/openstack/gce-api>`__
 glare                                  `git://git.openstack.org/openstack/glare <https://git.openstack.org/cgit/openstack/glare>`__
 group-based-policy                     `git://git.openstack.org/openstack/group-based-policy <https://git.openstack.org/cgit/openstack/group-based-policy>`__
+gyan                                   `git://git.openstack.org/openstack/gyan <https://git.openstack.org/cgit/openstack/gyan>`__
 heat                                   `git://git.openstack.org/openstack/heat <https://git.openstack.org/cgit/openstack/heat>`__
 heat-dashboard                         `git://git.openstack.org/openstack/heat-dashboard <https://git.openstack.org/cgit/openstack/heat-dashboard>`__
 horizon-mellanox                       `git://git.openstack.org/openstack/horizon-mellanox <https://git.openstack.org/cgit/openstack/horizon-mellanox>`__