Adding pure_repos to the AIO model

* This patch is used as workaround solution for one of
the cases covered by PROD-14299

* In case of needed "purge_repos: true" will be passed through SALT_OVERRIDES
in jenkins job

Change-Id: I84478c17fd112bf48eafeff1f20885467d3b0e8f
diff --git a/classes/cluster/virtual-mcp11-aio/infra/init.yml b/classes/cluster/virtual-mcp11-aio/infra/init.yml
index 5bfe7c9..46d0de0 100644
--- a/classes/cluster/virtual-mcp11-aio/infra/init.yml
+++ b/classes/cluster/virtual-mcp11-aio/infra/init.yml
@@ -1,3 +1,4 @@
 parameters:
   _param:
-    apt_mk_version: stable
\ No newline at end of file
+    apt_mk_version: stable
+    linux_system_purge_repos: false