Switch all mirror repos to https

This patch updates all repos in reclass-system for mirror.mirantis.com
to use https scheme.

Change-Id: Ic48207caf5746f8e9395e4b5552a6b9c8df49a92
Related-Prod:  PROD-27431
diff --git a/maas/region/single.yml b/maas/region/single.yml
index 52a613e..e3d0305 100644
--- a/maas/region/single.yml
+++ b/maas/region/single.yml
@@ -4,7 +4,7 @@
 parameters:
   _param:
     maas_admin_username: mirantis
-    maas_region_main_archive: http://mirror.mirantis.com/${_param:mcp_version}/ubuntu/
+    maas_region_main_archive: https://mirror.mirantis.com/${_param:mcp_version}/ubuntu/
   maas:
     cluster:
       enabled: true