Add thread_options.h

The options are always problematic to merge between the master
repo and gfio. So import this bit from gfio.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
Unify options with gfio

Add the parser features and unify the option table.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
parse: bring in more stuff from gfio

Signed-off-by: Jens Axboe <axboe@kernel.dk>
parse: fix spelling error

Signed-off-by: Jens Axboe <axboe@kernel.dk>
Categorize engine and profile options

Signed-off-by: Jens Axboe <axboe@kernel.dk>
tiobench: remove duplicate profile group

Signed-off-by: Jens Axboe <axboe@kernel.dk>