Commenting out the PagerDuty configuration file staging.

I was looking into why PagerDuty isn't triggered for incidents, and it turns out pagerduty_nagios.cfg file has an incorrect API key.

This script assumes that the correct pagerduty_nagios.cfg file is manually placed in the puppet directory on the server, but this is highly error prone as the git source directory can get wiped out.

As we move to https://github.com/jenkins-infra/jenkins-infra this will get replaced by hiera GPG, so in the mean time I'm simply removing this to prevent my manually edited file at /etc/nagios3/conf.d/pagerduty_nagios.cfg  from getting overwritten.