fix: network shutdown was not handle properly (#10927)

fixes a regression introduced in #10859, due
to the error returned by rest.Client being typed
i.e *rest.NetworkError - IsNetworkHostDown function
didn't work as expected to detect network issues.

This in-turn aggravated the situations when nodes
are disconnected leading to performance loss.

cmd/peer-rest-client.go

@@ -882,7 +882,7 @@ func newPeerRESTClient(peer *xnet.Host) *peerRESTClient {
 		defer cancel()
 		respBody, err := healthClient.Call(ctx, peerRESTMethodHealth, nil, nil, -1)
 		xhttp.DrainBody(respBody)
-		return !xnet.IsNetworkOrHostDown(err, false)
+		return !isNetworkError(err)
 	}
 
 	return &peerRESTClient{host: peer, restClient: restClient}