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/lock-rest-client.go

@@ -27,7 +27,6 @@ import (
 	xhttp "github.com/minio/minio/cmd/http"
 	"github.com/minio/minio/cmd/rest"
 	"github.com/minio/minio/pkg/dsync"
-	xnet "github.com/minio/minio/pkg/net"
 )
 
 // lockRESTClient is authenticable lock REST client
@@ -161,7 +160,7 @@ func newlockRESTClient(endpoint Endpoint) *lockRESTClient {
 		defer cancel()
 		respBody, err := healthClient.Call(ctx, lockRESTMethodHealth, nil, nil, -1)
 		xhttp.DrainBody(respBody)
-		return !xnet.IsNetworkOrHostDown(err, false)
+		return !isNetworkError(err)
 	}
 
 	return &lockRESTClient{endpoint: endpoint, restClient: restClient}