app/testpmd: add cmd for dedicated LACP Rx/Tx queues

app/testpmd: add cmd for dedicated LACP Rx/Tx queues

Add new command to support enable/disable of dedicated Tx/Rx queue on
each slave of a bond device for LACP control plane traffic.

    set bonding lacp dedicated_queues <port_id> [enable|disable]

When enabled this option creates dedicated queues on each slave device
for LACP control plane traffic. This removes the need to filter control
plane packets in the data path.

Signed-off-by: Tomasz Kulasek <tomaszx.kulasek@intel.com>
Signed-off-by: Declan Doherty <declan.doherty@intel.com>