Tidy up remove lumberjack

This just removed what we added in in the recent switch to
logstashforwarder. It seems there are a few other resources related to
lumberjack still lying around.

What's the deal with `/etc/logstash/lumberjack.pub` in `modules/performanceplatform/manifests/monitoring/logstash.pp` ?

This should basically do nothing. It just removes stuff we needed to remove lumberjack in a previous pr.