Enforce quota checks after crawl (#10036)

Enforce bucket quotas when crawling has finished. 
This ensures that we will not do quota enforcement on old data.

Additionally, delete less if we are closer to quota than we thought.

cmd/server-main.go

@@ -360,7 +360,6 @@ func startBackgroundOps(ctx context.Context, objAPI ObjectLayer) {
 	}
 
 	initDataCrawler(ctx, objAPI)
-	initQuotaEnforcement(ctx, objAPI)
 }
 
 // serverMain handler called for 'minio server' command.