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/service/nova21.yml b/keystone/client/service/nova21.yml
index 27a0580..9de386e 100644
--- a/keystone/client/service/nova21.yml
+++ b/keystone/client/service/nova21.yml
@@ -11,6 +11,7 @@
             service:
               user:
                 nova:
+                  name: ${_param:keystone_nova_username}
                   is_admin: true
                   password: ${_param:keystone_nova_password}
                   email: ${_param:admin_email}