Branch b1_4

Branch b1_4
Description: Creating more than 1000 files for a single job may cause a load
	     imbalance on the OSTs if there are also a large number of OSTs.
Details    : qos_prep_create() uses an OST index reseed value that is an
	     even multiple of the number of available OSTs so that if the
	     reseed happens in the middle of the object allocation it will
	     still utilize the OSTs as uniformly as possible.
b=8330
r=behlendorf (tested on BG/L)