test/hash: use jhash for multi-writer
test/hash: use jhash for multi-writer

With sequential key, the test will cover more corner
cases with jhash instead of crc hash, since jhash
generates more random hash pattern on sequential key.
It is useful for functional verification.

Signed-off-by: Yipeng Wang <7cbe00ff6364999b5548d30abb0722f7c2a7092c@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk