migrate all bucket metadata into a single file (#9586)

this is a major overhaul by migrating off all
bucket metadata related configs into a single
object '.metadata.bin' this allows us for faster
bootups across 1000's of buckets and as well
as keeps the code simple enough for future
work and additions.

Additionally also fixes #9396, #9394

cmd/daily-lifecycle-ops.go

@@ -57,12 +57,15 @@ func lifecycleRound(ctx context.Context, objAPI ObjectLayer) error {
 
 	for _, bucket := range buckets {
 		// Check if the current bucket has a configured lifecycle policy, skip otherwise
-		l, ok := globalLifecycleSys.Get(bucket.Name)
-		if !ok {
+		l, err := globalLifecycleSys.Get(bucket.Name)
+		if err != nil {
+			if _, ok := err.(BucketLifecycleNotFound); !ok {
+				logger.LogIf(ctx, err)
+			}
 			continue
 		}
 
-		_, bucketHasLockConfig := globalBucketObjectLockSys.Get(bucket.Name)
+		rcfg, _ := globalBucketObjectLockSys.Get(bucket.Name)
 
 		// Calculate the common prefix of all lifecycle rules
 		var prefixes []string
@@ -88,7 +91,7 @@ func lifecycleRound(ctx context.Context, objAPI ObjectLayer) error {
 				}
 				// Find the action that need to be executed
 				if l.ComputeAction(obj.Name, obj.UserTags, obj.ModTime) == lifecycle.DeleteAction {
-					if bucketHasLockConfig && enforceRetentionForDeletion(ctx, obj) {
+					if rcfg.LockEnabled && enforceRetentionForDeletion(ctx, obj) {
 						continue
 					}
 					objects = append(objects, obj.Name)