Prefix external io engine loading with 'external'

This is needed because the parser checks the allowed values now,
which broke ioengine=/some/external/file.o for loading an
external engine.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
1 file changed