openssh client fix

PROD-21335

Change-Id: I2ef7bb7ad9b4a1afa02e868861060e3e78a15c42
diff --git a/openssh/client/root.yml b/openssh/client/root.yml
index 145f5da..66f8f88 100644
--- a/openssh/client/root.yml
+++ b/openssh/client/root.yml
@@ -36,7 +36,9 @@
       user:
         root:
           enabled: true
-          private_key:
-            type: rsa
-            key: ${_param:root_private_key}
           user: ${linux:system:user:root}
+          private_key: ${private_keys:root}
+  private_keys:
+    root:
+      type: rsa
+      key: ${_param:root_private_key}