changed Use_Getattr_Directory_Invalidation to 0
Ported from 1.5.x: 3efa36184166f8b83d1787aefecf70d82b8458bd

Signed-off-by: suhrud <supatank@in.ibm.com>
Changed Nb_Worker from 128 to 512
Ported from 1.5.x: a15038ddb492c3146ae57c171c490126ef6b67e1

Signed-off-by: suhrud <supatank@in.ibm.com>