Remove XL multipart tmp files when the latter is canceled (#3214)

XL multipart fails to remove tmp files when an error occurs during upload, this case covers the scenario where an upload is canceled manually by the client in the middle of job.

cmd/object-api-putobject_test.go

@@ -23,6 +23,7 @@ import (
 	"io/ioutil"
 	"os"
 	"path"
+	"runtime"
 	"testing"
 )
 
@@ -326,6 +327,9 @@ func testObjectAPIPutObjectStaleFiles(obj ObjectLayer, instanceType string, disk
 
 // Wrapper for calling Multipart PutObject tests for both XL multiple disks and single node setup.
 func TestObjectAPIMultipartPutObjectStaleFiles(t *testing.T) {
+	if runtime.GOOS == "windows" {
+		return
+	}
 	ExecObjectLayerStaleFilesTest(t, testObjectAPIMultipartPutObjectStaleFiles)
 }