We should show orphaned nodes.

[skx]

The puppet-dashboard has a notion of "unresponsive" nodes, nodes which haven't seen an update in the past while.

This project prunes reports after a few days, so such nodes will gradually fall off the display over time, but we should still show them.

Suggest we change getIndexNodes to only consider reports which are <24hours old, and then add a faux "orphaned" state to cover those which are outside that window.

[skx]

TODO: Avoid nodes being in multiple states :)