server: remove ancient TODO

This dates to 69520be in 2017. It seems
safe at this point to conclude that the answer is either "no" or that
this TODO has been actioned.

Author: tamird

pkg/server/start_listen.go

@@ -158,7 +158,6 @@ func startListenRPCAndSQL(
 	waitForQuiesce := func(context.Context) {
 		<-stopper.ShouldQuiesce()
 		drpcCancel()
-		// TODO(bdarnell): Do we need to also close the other listeners?
 		netutil.FatalIfUnexpected(grpcL.Close())
 		netutil.FatalIfUnexpected(grpcLoopbackL.Close())
 		netutil.FatalIfUnexpected(drpcL.Close())         // Closing this listener is as good as closing drpcTLSL