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/bitrot_test.go

@@ -34,7 +34,7 @@ func testBitrotReaderWriterAlgo(t *testing.T, bitrotAlgo BitrotAlgorithm) {
 	volume := "testvol"
 	filePath := "testfile"
 
-	disk, err := newPosix(tmpDir)
+	disk, err := newPosix(tmpDir, "")
 	if err != nil {
 		t.Fatal(err)
 	}