fix storage info output with unordered endpoints arguments (#9610)

Shuffling arguments that we pass to MinIO server are supported. However,
when that happens, Prometheus returns wrong information about disks usage
and online/offline status.

The commit fixes the issue by avoiding relying on xl.endpoints since
it is not ordered.

cmd/posix-diskid-check.go

@@ -39,6 +39,10 @@ func (p *posixDiskIDCheck) IsOnline() bool {
 	return storedDiskID == p.diskID
 }
 
+func (p *posixDiskIDCheck) IsLocal() bool {
+	return p.storage.IsLocal()
+}
+
 func (p *posixDiskIDCheck) CrawlAndGetDataUsage(ctx context.Context, cache dataUsageCache) (dataUsageCache, error) {
 	return p.storage.CrawlAndGetDataUsage(ctx, cache)
 }