Make icinga alert re: puppet client more precise

Changes "Puppet has not run in the last 10 hours" to "No successful
Puppet run in the last 10 hours". When this alert is emitted, Puppet is
typically running like clockwork every half hour, but is consistently
failing because some configuration change cannot be applied. The
reworded alert makes that clearer, I think.

Change-Id: Ief78d44d8205a9220cdd486709733b6e2d6d99ca
Merge "Make icinga alert re: puppet client more precise" into production