Remove upstream Salt repos from models and replace with mcp repos

Fixes: PROD-22008 (PROD:22008)

Change-Id: I1537c55fef23d732952b944dc6f2dda3e37d02df
diff --git a/classes/cluster/virtual-mcp-mitaka-ovs/openstack/dashboard.yml b/classes/cluster/virtual-mcp-mitaka-ovs/openstack/dashboard.yml
index 6b484c5..dfbefeb 100644
--- a/classes/cluster/virtual-mcp-mitaka-ovs/openstack/dashboard.yml
+++ b/classes/cluster/virtual-mcp-mitaka-ovs/openstack/dashboard.yml
@@ -1,6 +1,6 @@
 classes:
 - system.horizon.server.single
-- system.linux.system.repo.saltstack.xenial
+- system.linux.system.repo.mcp.apt_mirantis.saltstack
 parameters:
   _param:
     horizon_site_branding: OpenStack Dashboard