Add a parameter for disabling public endpoints HTTP probes

Change-Id: I2f6c793147b38e807ff5e56843c28a6a5dc25724
Related-To: PROD-35871
diff --git a/tests/pillar/repo_extra.sls b/tests/pillar/repo_extra.sls
index 742a90f..2ccf3fa 100644
--- a/tests/pillar/repo_extra.sls
+++ b/tests/pillar/repo_extra.sls
@@ -3,6 +3,6 @@
     enabled: true
     repo:
       mcp_extra_repo:
-        source: "deb [arch=amd64] http://apt-mk.mirantis.com/{{ grains.get('oscodename') }}/ nightly extra"
+        source: "deb [arch=amd64] http://mirror.mirantis.com/nightly/extra/xenial xenial main"
         architectures: amd64
-        key_url: "http://apt-mk.mirantis.com/public.gpg"
+        key_url: "http://mirror.mirantis.com/nightly/extra/xenial/archive-extra.key"