examples/l3fwd: fix validation for queue id of config tuple

examples/l3fwd: fix validation for queue id of config tuple

Added validation for queue id of config parameter tuple.

This validation enforces user to enter queue ids of a port
from 0 and in sequence.

This additional validation on queue ids avoids ixgbe crash caused
by null rxq pointer access inside ixgbe_dev_rx_init.

Reason for null rxq is, L3fwd application allocates memory only for
queues passed by user. But rte_eth_dev_start tries to initialize rx
queues in sequence from 0 to nb_rx_queues,
which is not true and coredump while accessing the unallocated queue .

Fixes: af75078fece3 ("first public release")

Signed-off-by: Reshma Pattan <reshma.pattan@intel.com>
Acked-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>