Disable crawler in FS/NAS gateway mode (#9695)

No one really uses FS for large scale accounting
usage, neither we crawl in NAS gateway mode. It is
worthwhile to simply disable this feature as its
not useful for anyone.

Bonus disable bucket quota ops as well in, FS
and gateway mode

cmd/data-usage.go

@@ -55,8 +55,12 @@ const (
 
 // initDataUsageStats will start the crawler unless disabled.
 func initDataUsageStats(ctx context.Context, objAPI ObjectLayer) {
-	if env.Get(envDataUsageCrawlConf, config.EnableOn) == config.EnableOn {
-		go runDataUsageInfo(ctx, objAPI)
+	// data usage stats are only available erasure
+	// coded mode
+	if globalIsXL || globalIsDistXL {
+		if env.Get(envDataUsageCrawlConf, config.EnableOn) == config.EnableOn {
+			go runDataUsageInfo(ctx, objAPI)
+		}
 	}
 }