[Ci-users] Pattern for using JJB and python-cicoclient

Hello,

With David's help, I've built a better pattern to consume python-cicoclient
alongside JJB. A major goal of this work was to avoid using curl calls to
Github.

In summary, it uses a builder to get nodes and a publisher to release nodes
without leaking. I've created a Github repo[1] with a real-world job (actually
a copy of one of our jobs).

Please let me know if you find this useful and if you have suggestions for
improvements. As I convert more jobs to JJB, it will be more flexible for
requesting more than one node and more than one OS version.

[1]: https://github.com/nigelbabu/centos-ci-sample

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nigelb