Move "top" to daemon/top.go

This is part of an effort to break apart the deprecated server/ package

Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes)

daemon/daemon.go

@@ -158,6 +158,9 @@ func (daemon *Daemon) Install(eng *engine.Engine) error {
 	if err := eng.Register("container_changes", daemon.ContainerChanges); err != nil {
 		return err
 	}
+	if err := eng.Register("top", daemon.ContainerTop); err != nil {
+		return err
+	}
 	return nil
 }