add update when default repo is changed

Closes-Bug: #PROD-10623
Change-Id: I9e070f7f96b1f0b8eafa12403c5df4ae5be3e42c
diff --git a/linux/system/repo.sls b/linux/system/repo.sls
index b1c3e1b..813c1e1 100644
--- a/linux/system/repo.sls
+++ b/linux/system/repo.sls
@@ -191,6 +191,12 @@
     - require:
       - pkg: linux_repo_prereq_pkgs
 
+refresh_default_repo:
+  module.wait:
+    - name: pkg.refresh_db
+    - watch:
+      - file: default_repo_list
+
 {%- endif %}
 
 {%- endif %}