Test would occasionally fail as follows:

```
mysqltest: At line 20: query 'SELECT COUNT(*) = 0 FROM t1' failed:
1317: Query execution was interrupted

```

This was due to a `CREATE TABLE` applied concurrently that would
occasionally cause the `SELECT` to be BF aborted, due to MDL
conflict.

The `SELECT` is executed while `wsrep_on=OFF`. The change makes sure
it is executed only after wsrep is enabled again.