app/test-pipeline: fix table hash LRU initialization

app/test-pipeline: fix table hash LRU initialization

macro ‘APP_METADATA_OFFSET’ was not used to initialize
‘signature_offset’ and ‘key_offset’ part of struct
rte_table_hash_lru_params.
Instead integer offset values were directly used.

with this fix 'hash-8-lru', 'hash-16-lru', 'hash-32-lru' table types are
able to forward traffic as expected.

Fixes: 48f31ca50cc4 ("app/pipeline: packet framework benchmark")
Signed-off-by: Sankar Chokkalingam <sankarx.chokkalingam@intel.com>
Signed-off-by: Guruprasad Rao <guruprasadx.rao@intel.com>
Acked-by: Cristian Dumitrescu <cristian.dumitrescu@intel.com>