add configurable delta for skipping shards (#13967)

This PR is an attempt to make this configurable
as not all situations have same level of tolerable
delta, i.e disks are replaced days apart or even
hours.

There is also a possibility that nodes have drifted
in time, when NTP is not configured on the system.

cmd/erasure-object.go

@@ -28,7 +28,6 @@ import (
 	"strconv"
 	"strings"
 	"sync"
-	"time"
 
 	"github.com/minio/madmin-go"
 	"github.com/minio/minio-go/v7/pkg/tags"
@@ -182,7 +181,6 @@ func (er erasureObjects) GetObjectNInfo(ctx context.Context, bucket, object stri
 
 	if !fi.DataShardFixed() {
 		diskMTime := pickValidDiskTimeWithQuorum(metaArr, fi.Erasure.DataBlocks)
-		delta := 5 * time.Second
 		if !diskMTime.Equal(timeSentinel) && !diskMTime.IsZero() {
 			for index := range onlineDisks {
 				if onlineDisks[index] == OfflineDisk {
@@ -191,7 +189,7 @@ func (er erasureObjects) GetObjectNInfo(ctx context.Context, bucket, object stri
 				if !metaArr[index].IsValid() {
 					continue
 				}
-				if !metaArr[index].AcceptableDelta(diskMTime, delta) {
+				if !metaArr[index].AcceptableDelta(diskMTime, shardDiskTimeDelta) {
 					// If disk mTime mismatches it is considered outdated
 					// https://github.com/minio/minio/pull/13803
 					//