added system.linux.system.repo.mcp.salt where missing

Change-Id: Iec33efa97a7638437ddfe280ec3f2c69889e791f
diff --git a/classes/cluster/sl-os-contrail/infra/config.yml b/classes/cluster/sl-os-contrail/infra/config.yml
index ba4fe44..79d69bf 100755
--- a/classes/cluster/sl-os-contrail/infra/config.yml
+++ b/classes/cluster/sl-os-contrail/infra/config.yml
@@ -5,6 +5,7 @@
 - system.linux.system.single
 - system.linux.system.repo.mcp.salt
 - system.linux.system.repo.mcp.openstack
+- system.linux.system.repo.docker
 - system.openssh.client.lab
 - system.salt.master.api
 - system.salt.master.pkg