Use name instead of username for a user

Change-Id: I2dd4c1ffdd6c7005029e9375849f0e8082d1a331
diff --git a/metadata/service/server/single.yml b/metadata/service/server/single.yml
index 66f9d6c..0524e89 100644
--- a/metadata/service/server/single.yml
+++ b/metadata/service/server/single.yml
@@ -12,7 +12,7 @@
       enabled: true
       users:
         admin:
-          username: ${_param:rundeck_admin_username}
+          name: ${_param:rundeck_admin_username}
           password: ${_param:rundeck_admin_password}
           roles:
             - user