case-anon-*w*: use unit_size instead of fixed mem/2

Like commit 195e6559d20e ("case-anon-w-rand: use unit_size instead of
fixed $((mem / 2))"), this patch converts all anon write cases to respect
unit_size environment variable.

Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
9 files changed