This script looks if there is a puppet agent process and then it checks the
last state summary file and checks when puppet agent last run the catalog.

The plugin should be run by NRPE (or similar software) and reports ok. warn or
crit back.

Please note that the user executing this command (normally nagios or icinga)
should either have an entry in /etc/sudoers like the following one:
nagios ALL=NOPASSWD:/usr/bin/puppet,/usr/lib/nagios/plugins/check_puppet_agent,/bin/kill
or the plugin script itself should be run as root (permissions 4755).

Furthermore this plugin checks some fail counters and warn about them if any of
them is greater than 0.