Generate random keystone users

Depends-On: https://gerrit.mcp.mirantis.com/#/c/44319/
Depends-On: https://gerrit.mcp.mirantis.com/#/c/45118/
Depends-On: https://gerrit.mcp.mirantis.com/#/c/45119/

Related-Prod: PROD-29868
Related-Prod: PROD-31315
(cherry picked from commit f5956c2f6151cc5d99659103f90641ea66eac44a)
(cherry picked from commit 70dd0f0587eb297fbefdea43837839c4983b8378)

Change-Id: I402be73437d5397224184a4fd71e2f6abae24db2
diff --git a/keystone/client/v3/service/panko.yml b/keystone/client/v3/service/panko.yml
index 226f601..1620d91 100644
--- a/keystone/client/v3/service/panko.yml
+++ b/keystone/client/v3/service/panko.yml
@@ -8,6 +8,7 @@
         v3:
           users:
             panko:
+              name: ${_param:keystone_panko_username}
               password: ${_param:keystone_panko_password}
               email: ${_param:admin_email}
               options: ${_param:openstack_service_user_options}