Move 'debmirror*' to defaults

Change-Id: I4ff9b4e05f0cd170186be016870c1bc307cbdd50
Related-Bug: PROD-23771 (PROD:23771)
diff --git a/defaults/init.yml b/defaults/init.yml
index f17e399..022f44c 100644
--- a/defaults/init.yml
+++ b/defaults/init.yml
@@ -1,5 +1,6 @@
 classes:
 - system.defaults.linux_system_repo
+- system.defaults.debmirror
 parameters:
 # Transition in progress.
 # Please ignore 'G' transition marker - it uses only for internal purposes