ipn/ipnlocal: don't install any magicdns names if not proxying.

Signed-off-by: David Anderson <danderson@tailscale.com>

ipn/ipnlocal/local.go

@@ -1493,12 +1493,16 @@ func (b *LocalBackend) authReconfig() {
 			}
 			dcfg.Hosts[name] = ips
 		}
+		// TODO: hack to make the current code continue to work while
+		// refactoring happens.
+		if proxied {
 			dcfg.Hosts = map[string][]netaddr.IP{}
 			set(nm.Name, nm.Addresses)
 			for _, peer := range nm.Peers {
 				set(peer.Name, peer.Addresses)
 			}
 		}
+	}
 
 	err = b.e.Reconfig(cfg, rcfg, &dcfg)
 	if err == wgengine.ErrNoChanges {