Generate random keystone users

Change-Id: I8dbd07b10d29b43d1c35fa76bcaa0f0efb32beda
Related-Prod: PROD-29868
diff --git a/panko/server/single.yml b/panko/server/single.yml
index ea8f4a1..a10562a 100644
--- a/panko/server/single.yml
+++ b/panko/server/single.yml
@@ -16,8 +16,12 @@
   panko:
     server:
       identity:
+        user: ${_param:keystone_panko_username}
+        password: ${_param:keystone_panko_password}
         protocol: ${_param:internal_protocol}
       database:
+        user: ${_param:mysql_panko_username}
+        password: ${_param:mysql_panko_password}
         x509:
           enabled: ${_param:openstack_mysql_x509_enabled}
           ca_file: ${_param:mysql_panko_ssl_ca_file}