Our initial integration with pybal will be done via local files on the pybal server filesystem;
- the etcd schema has been defined in T100793
- confd will need to be installed on precise and trusty (we should check it's actually been uploaded to both)
- a (pretty-simple) template for confd needs to be written, and some puppet class to ship it
- a (again, very simple) syntax check tool for the generated file should be created so that confd can validate its data.
- possibly it will involve using inotify via this patch https://gerrit.wikimedia.org/r/#/c/213223/