tests/00raid5-zero: Introduce test to exercise --write-zeros.

tests/00raid5-zero: Introduce test to exercise --write-zeros.

Attempt to create a raid5 array with --write-zeros. If it is successful
check the array to ensure it is in sync.

If it is unsuccessful and an unsupported error is printed, skip the
test.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Acked-by: Kinga Tanska <kinga.tanska@linux.intel.com>
Reviewed-by: Xiao Ni <xni@redhat.com>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Acked-by: Coly Li <colyli@suse.de>
Signed-off-by: Jes Sorensen <jes@trained-monkey.org>