app/test: verify more jhash functions

app/test: verify more jhash functions

Added new test that verifies that rte_jhash_1words,
rte_jhash_2words and rte_jhash_3words return the same
values as rte_jhash.

Note that this patch has been added after the update
of the jhash function because these 3 functions did not
return the same values as rte_jhash before

Signed-off-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>