Add params from backupninja and xtrabackup formulas

Related: PROD-27135 (PROD:27135)
Related: PROD-27147 (PROD:27147)
Related: PROD-27540 (PROD:27540)

Change-Id: I3b2e6d675c83e2a27b437199a6d06edb645106ca
diff --git a/xtrabackup/server/single.yml b/xtrabackup/server/single.yml
index ad06a94..92d9fc3 100644
--- a/xtrabackup/server/single.yml
+++ b/xtrabackup/server/single.yml
@@ -1,9 +1,12 @@
 classes:
 - service.xtrabackup.server.single
 parameters:
-  _param:
-    xtrabackup_qpress_source: pkg
-    xtrabackup_qpress_source_name: qpress
+  xtrabackup:
+    server:
+      backup_dir: /srv/volumes/backup/xtrabackup
+      key:
+        xtrabackup_pub_key:
+          key: ${_param:xtrabackup_public_key}
   linux:
     system:
       cron: