The test innodb.log_file_name_debug failed to ensure that
the bogus redo log record that its debug injection emitted
would be consumed by a redo log checkpoint before running a
subsequent test, which could perform crash recovery.

Add an extra shutdown to ensure that a redo log checkpoint is
generated. In this way, the following will succeed:

./mtr --no-reorder innodb.log_file_name_debug innodb.read_only_recovery