heal: Avoid spinning up object healing during startup (#8819)

auto-heal disks, metadata and buckets in background but
not objects, let the auto heal kick in for objects after
the cluster has been up for a while.

cmd/background-newdisks-heal-ops.go

@@ -64,6 +64,8 @@ func monitorLocalDisksAndHeal() {
 
 	// Perform automatic disk healing when a disk is replaced locally.
 	for {
+		time.Sleep(defaultMonitorNewDiskInterval)
+
 		// Attempt a heal as the server starts-up first.
 		localDisksInZoneHeal := make([]Endpoints, len(z.zones))
 		for i, ep := range globalEndpoints {
@@ -91,8 +93,6 @@ func monitorLocalDisksAndHeal() {
 		// Ensure that reformatting disks is finished
 		bgSeq.sourceCh <- nopHeal
 
-		time.Sleep(defaultMonitorNewDiskInterval)
-
 		var erasureSetInZoneToHeal = make([][]int, len(localDisksInZoneHeal))
 		// Compute the list of erasure set to heal
 		for i, localDisksToHeal := range localDisksInZoneHeal {