Generate random keystone users

Change-Id: I8dbd07b10d29b43d1c35fa76bcaa0f0efb32beda
Related-Prod: PROD-29868
diff --git a/galera/server/database/neutron.yml b/galera/server/database/neutron.yml
index b5ee606..772a57d 100644
--- a/galera/server/database/neutron.yml
+++ b/galera/server/database/neutron.yml
@@ -7,12 +7,12 @@
         neutron:
           encoding: 'utf8'
           users:
-          - name: 'neutron'
+          - name: '${_param:mysql_neutron_username}'
             password: '${_param:mysql_neutron_password}'
             host: '%'
             rights: 'all'
             ssl_option: ${_param:mysql_neutron_ssl_option}
-          - name: 'neutron'
+          - name: '${_param:mysql_neutron_username}'
             password: '${_param:mysql_neutron_password}'
             host: '${_param:cluster_local_address}'
             rights: 'all'