[master]Fix import lib issue

[tim-rj]

- What I did
show interface breakout
- How I did it

show interface breakout

- How to verify it

show interface breakout

- Previous command output (if the output of a command-line utility has changed)

root@sonic:/var/core# show interfaces breakout 
Traceback (most recent call last):
  File "/usr/bin/show", line 12, in <module>
    sys.exit(cli())
  File "/usr/lib/python2.7/dist-packages/click/core.py", line 764, in __call__
    return self.main(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/click/core.py", line 717, in main
    rv = self.invoke(ctx)
  File "/usr/lib/python2.7/dist-packages/click/core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/lib/python2.7/dist-packages/click/core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/lib/python2.7/dist-packages/click/core.py", line 1114, in invoke
    return Command.invoke(self, ctx)
  File "/usr/lib/python2.7/dist-packages/click/core.py", line 956, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/lib/python2.7/dist-packages/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/click/decorators.py", line 17, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/show/interfaces/__init__.py", line 118, in breakout
    config_db = ConfigDBConnector()
NameError: global name 'ConfigDBConnector' is not defined

- New command output (if the output of a command-line utility has changed)

No import error, just notify  platform.json not exist.
root@switch2:/usr/lib/python2.7/dist-packages/show/interfaces# show interfaces breakout
[Errno 2] No such file or directory: '/usr/share/sonic/device/x86_64-ruijie_b3010-r0/platform.json'
Aborted!

[tim-rj]

It is related to issue:sonic-net/sonic-buildimage#5343

[tim-rj]

Any one can help forward?

[lguohan]

can you only include the changes needed by the fix?

[tim-rj]

can you only include the changes needed by the fix?
if only import missing libs(remove added global vars & function), 'show interface breakout' will still fail, do I still need to remove the vars & function? Help confirm, waiting reply .

[tim-rj]

move to a new PR #1179 for refolk the component and modify as review suggestion, close this one.