Remove Real from equipment error

On the /equipment/list page when you edit 'Reals of equipment' and try to remove one the following error occurs:
'Vip' object has no attribute 'get_by_id'.

The problem is in this call from [Equipment Views](https://github.com/globocom/GloboNetworkAPI-WebUI/blob/master/CadVlan/Equipment/views.py#L80) file.

To solve it, one can add the method 'get_by_id' to [Equipment implementation](https://github.com/globocom/GloboNetworkAPI-client-python/blob/master/networkapiclient/ApiEquipment.py) at Python Client project .