Remove upstream Salt repos from models and replace with mcp repos

Fixes: PROD-22008 (PROD:22008)

Change-Id: I1537c55fef23d732952b944dc6f2dda3e37d02df
diff --git a/classes/cluster/model-manager/model_manager/dashboard.yml b/classes/cluster/model-manager/model_manager/dashboard.yml
index db4a614..c2fea60 100644
--- a/classes/cluster/model-manager/model_manager/dashboard.yml
+++ b/classes/cluster/model-manager/model_manager/dashboard.yml
@@ -1,7 +1,7 @@
 classes:
 - system.linux.system.repo.mcp.apt_mirantis.ubuntu
 - system.linux.system.repo.mcp.extra
-- system.linux.system.repo.saltstack.xenial
+- system.linux.system.repo.mcp.apt_mirantis.saltstack
 - system.linux.network.hosts
 - system.model_manager.server.integration
 - cluster.model-manager.model_manager.identity