Sometimes you just want to know what machines a given partition
should be on, or what handoffs that partition would use if needed.
We've been meaning to add this option to swift-get-nodes for quite
some time, but I just finally got to it.
Example: swift-get-nodes /etc/swift/object.ring.gz -p 123
I tried to leave as much of the existing swift-get-nodes unaltered,
so the output isn't exactly distilled to just what you'd need for
getting a partition's nodes. But it should suffice for what it is, an
admin tool.
Change-Id: I438400ddc0eecbf9c48266e7f38a2e4f0765f374
e415e4d235