fio: add verify_header_seed option
Add a new option to disable the verify header seed check. The header
seed check is enabled by default.
There have been numerous issues observed with header seed mismatch. Hence
this allows end user to disable this check, and proceed with the checksum
verification. This is similar to option verify_write_sequence, which
allows the capability to disable write sequence number check.
Update the documentation accordingly.
Signed-off-by: Ankit Kumar <ankit.kumar@samsung.com>