Puppet nodes are unresponsive after 30 minutes

This lowers the 'unresponsive_hours' variable to .5 in puppetboard
meaning if a node misses its report 3 times it becomes flagged in
the ui.

Change-Id: I5c86fe09ac7647278c63500593c084451b8fc202
Merge "Puppet nodes are unresponsive after 30 minutes"