performance model: mutatis mutandum
	changed FileStore simulation to work with new tupple
	returns from file system simulation.  But it still
	needs to be changed to exploit the added information
	and return its own tupple.

Signed-off-by: Mark Kampe <mark.kampe@gmail.com>
performance model: get test bsizes from dict

Signed-off-by: Mark Kampe <mark.kampe@gmail.com>