Add fuel node list parameterization

Registered by Alexander Bozhenko

We have this command that can print all info about nodes in json format:
fuel node --json

Without --json flag fuel print fields, specified here:
https://github.com/stackforge/python-fuelclient/blob/master/fuelclient/commands/node.py#L23
It will be useful to have ability to specify fields selection for fuel node command, e.g
fuel node --fields fields_list_goes_here

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Drafter:
Alexander Bozhenko
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New
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