Fix certificates creation for image sign

Change-Id: I60984a2badac898b4d375dd22981e4b303f8f5db
Related-PROD: PROD-25719
diff --git a/barbican/client/v1/signed_images/octavia.yml b/barbican/client/v1/signed_images/octavia.yml
index c348674..ae708cf 100644
--- a/barbican/client/v1/signed_images/octavia.yml
+++ b/barbican/client/v1/signed_images/octavia.yml
@@ -1,3 +1,6 @@
+classes:
+- system.barbican.client.v1.octavia
+
 parameters:
   _param:
     octavia_image_cert_key: '/etc/octavia/certs/image.key'