Add to the CLI fuel command the possibility to filter by roles and list only IPs

Registered by Fabrizio Soppelsa on 2015-11-25

Many times we have to run shell loops to modify clusters on the fly.
Please add to the fuel/fuel2 CLI tool, commands to get the nodes IPs filtered by role, like

`fuel nodes --controllers -q`
10.170.40.10
10.170.40.11
10.170.40.12

Or `fuel nodes --computes -q`
10.170.40.20
10.170.40.21
10.170.40.22
10.170.40.23
10.170.40.24
10.170.40.24

You say that with egrep and awk it's easy.
But when customers rename nodes adding spaces, that might be a problem.
Imagine a complex for loop working there and creating unmanageable chaos just because of syntax.

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Drafter:
Fabrizio Soppelsa
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