Unexport network.Stop

An exported function makes it look like it can be called from any
goroutine.

user.go

@@ -130,7 +130,7 @@ func (net *network) run() {
 	}
 }
 
-func (net *network) Stop() {
+func (net *network) stop() {
 	select {
 	case <-net.stopped:
 		return
@@ -452,7 +452,7 @@ func (u *user) deleteNetwork(id int64) error {
 			}
 		})
 
-		net.Stop()
+		net.stop()
 		u.networks = append(u.networks[:i], u.networks[i+1:]...)
 		return nil
 	}