New Zenoss cookbook maintainer/repository

Ohai Chefs,

We have transferred maintenance of the zenoss cookbook0 to David Petzel. David reported a few issues and opened pull requests, but as we're not using it internally, nor have people available to work on it, we thought it best to transfer maintenance to him and he agreed.

Thanks David!

The new repository is here:

Our opscode-cookbooks repository has an updated README indicating the new repository, and all the tickets in JIRA are closed out in favor of GH issues in the above repo.