Updated from generate-devstack-plugins-list

Change-Id: I1b357b2e668ff5ed56c5deb9d71709a7526e17ea
diff --git a/doc/source/plugin-registry.rst b/doc/source/plugin-registry.rst
index 771f2ef..7c97171 100644
--- a/doc/source/plugin-registry.rst
+++ b/doc/source/plugin-registry.rst
@@ -69,6 +69,7 @@
 ironic-staging-drivers                 `git://git.openstack.org/openstack/ironic-staging-drivers <https://git.openstack.org/cgit/openstack/ironic-staging-drivers>`__
 karbor                                 `git://git.openstack.org/openstack/karbor <https://git.openstack.org/cgit/openstack/karbor>`__
 karbor-dashboard                       `git://git.openstack.org/openstack/karbor-dashboard <https://git.openstack.org/cgit/openstack/karbor-dashboard>`__
+keystone                               `git://git.openstack.org/openstack/keystone <https://git.openstack.org/cgit/openstack/keystone>`__
 kingbird                               `git://git.openstack.org/openstack/kingbird <https://git.openstack.org/cgit/openstack/kingbird>`__
 kuryr-kubernetes                       `git://git.openstack.org/openstack/kuryr-kubernetes <https://git.openstack.org/cgit/openstack/kuryr-kubernetes>`__
 kuryr-libnetwork                       `git://git.openstack.org/openstack/kuryr-libnetwork <https://git.openstack.org/cgit/openstack/kuryr-libnetwork>`__