fix linux_distrib_codename to linux_system_codename
diff --git a/linux/system/repo-local/opencontrail.yml b/linux/system/repo-local/opencontrail.yml
index 90d47a0..31371c9 100644
--- a/linux/system/repo-local/opencontrail.yml
+++ b/linux/system/repo-local/opencontrail.yml
@@ -5,6 +5,6 @@
         tcpcloud_contrail:
           # oc30 is now by default
           refresh_db: ${_param:linux_repo_refresh_db}
-          source: "deb [arch=amd64] http://${_param:local_repo_url}/${_param:linux_distrib_codename}/ nightly tcp-oc30"
+          source: "deb [arch=amd64] http://${_param:local_repo_url}/${_param:linux_system_codename}/ nightly tcp-oc30"
           architectures: amd64
           key_url: "http://${_param:local_repo_url}/public.gpg"