interface: add tx-queue cli support for new tx infra

interface: add tx-queue cli support for new tx infra

Type: improvement

set interface tx-queue tap1 queue 2 threads 1-2
show hardware-interfaces tap1
              Name                Idx   Link  Hardware
tap1                               2     up   tap1
  Link speed: unknown
  RX Queues:
    queue thread         mode
    0     vpp_wk_1 (2)   polling
  TX Queues:
    queue shared thread(s)
    0     no     0
    1     no     1
    2     yes    1-2
    3     no     3
    4     no     4
  Ethernet address 02:fe:09:3a:48:ff
  VIRTIO interface
     instance 1

set interface tx-queue tap0 queue 4 threads
show hardware-interfaces tap0
              Name                Idx   Link  Hardware
tap0                               1     up   tap0
  Link speed: unknown
  RX Queues:
    queue thread         mode
    0     vpp_wk_0 (1)   polling
  TX Queues:
    queue shared thread(s)
    0     no     0
    1     no     1
    2     no     2
    3     no     3
    4     no
  Ethernet address 02:fe:03:6a:66:fc
  VIRTIO interface
     instance 0

Change-Id: I6154476ec9ff0b14287098529c88a14b779371a5
Signed-off-by: Mohsin Kazmi <sykazmi@cisco.com>