[multi-asic] Updated teamdctl bash script to support for multi-asic

[abdosi]

What I did:
Enhanced teamdctl bash script to work for Multi-asic. Added option -n [0 to n] (asic number).
Changes are similar to other scripts swssloglevel/bcmcmd that has multi-asic support.

Why I did:
Some of sonic-mgmt test case (test_lag_2.py) uses teamdctl command from test script.

How I Verify:
Usage: /usr/bin/teamdctl -n [0 to n] [OPTION]...

Single ASIC:

teamdctl PortChannel0002 state
setup:
  runner: lacp
ports:
  Ethernet0
    link watches:
      link summary: up

Multi ASIC

teamdctl -n 0 PortChannel0002 state
setup:
  runner: lacp
ports:
  Ethernet0
    link watches:
      link summary: up
      instance[link_watch_0]:
        name: ethtool
        link: up
        down count: 0
    runner:
      aggregator ID: 139, Selected
      selected: yes
      state: current
  Ethernet4
    link watches:
      link summary: up
      instance[link_watch_0]:
        name: ethtool
        link: up
        down count: 0
    runner:
      aggregator ID: 139, Selected
      selected: yes
      state: current
runner:
  active: yes
  fast rate: no

[judyjoseph]

LGTM