Add selector to master service when switching to CM (#2955)

Add service selector comparison to compareServices
This is necessary for the proper switch of `kubernetes_use_configmaps` configuration value, as master service should have different label selector setup for those.

pkg/cluster/cluster.go

@@ -841,6 +841,10 @@ func (c *Cluster) compareServices(old, new *v1.Service) (bool, string) {
 		return false, "new service's owner references do not match the current ones"
 	}
 
+	if !reflect.DeepEqual(old.Spec.Selector, new.Spec.Selector) {
+		return false, "new service's selector does not match the current one"
+	}
+
 	return true, ""
 }