xl: All nodes create meta volumes in its local disks (#8786)

Meta volumes directories, tmp/, background-ops/, etc..
undr .minio.sys are created when disks are formatted
but also when the cluster is started.

However using MakeVolBulk() is not appropriate in the
case of a user migrating from a version which does not
have .minio.sys/background-ops/. The reason is that
MakeVolBulk() exits early when an error is occured:
errVolumeExists in this case, which is expected since
some directories such as tmp/ already exist.

This commit will avoid use MakeVolBulk and use MakeVol
instead.

Also the PR will make each node creates meta volumes
in its local disks and stop relying on the first disk
since the first node could be offline.

cmd/format-xl_test.go

@@ -101,7 +101,7 @@ func TestFixFormatV3(t *testing.T) {
 		formats[j] = newFormat
 	}
 
-	if err = initFormatXLMetaVolume(storageDisks, formats); err != nil {
+	if err = initXLMetaVolumesInLocalDisks(storageDisks, formats); err != nil {
 		t.Fatal(err)
 	}