app/testpmd: new commands for ethertype filter

app/testpmd: new commands for ethertype filter

Following commands of ethertype filter are removed:
  - add_ethertype_filter (port_id) ethertype (eth_value)
  - remove_ethertype_filter (port_id) index (idx)
  - get_ethertype_filter (port_id) index (idx)
New command is added for ethertype filter by using filter_ctrl API and new
ethertype filter structure:
  - ethertype_filter (port_id) (add|del) (mac_addr|mac_ignr)
    (mac_address) ethertype (ether_type) (drop|fwd) queue (queue_id)

Signed-off-by: Jingjing Wu <jingjing.wu@intel.com>
Acked-by: Helin Zhang <helin.zhang@intel.com>