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

Change-Id: Iec33efa97a7638437ddfe280ec3f2c69889e791f
diff --git a/classes/cluster/virtual-mcp11-k8s-calico/stacklight/server.yml b/classes/cluster/virtual-mcp11-k8s-calico/stacklight/server.yml
index 3bfee95..f427930 100644
--- a/classes/cluster/virtual-mcp11-k8s-calico/stacklight/server.yml
+++ b/classes/cluster/virtual-mcp11-k8s-calico/stacklight/server.yml
@@ -3,6 +3,7 @@
 - system.linux.system.repo.elasticsearch
 - system.linux.system.repo.kibana
 - system.linux.system.repo.influxdb
+- system.linux.system.repo.docker
 # Needed to install Galera packages
 - system.linux.system.repo.mcp.openstack
 - system.elasticsearch.server.cluster