systemd-tmpfiles conf to clean up PE 2016.5.2 puppetdb "dead letter" files left by FACT-1732

puppetdb-discard-replace-facts.conf

# This ages off the ridiculous amount of dead letter files generated by
# PuppetDB when they are older than three days (as a result of FACT-1732)
#
# Place this in a file location like:
#
#   /etc/tmpfiles.d/puppetdb-discard-replace-facts.conf
#
# See:
#
#  * https://tickets.puppetlabs.com/browse/FACT-1732
#  * https://docs.puppet.com/puppetdb/4.2/maintain_and_tune.html#clean-up-the-dead-letter-office
#  * https://developers.redhat.com/blog/2016/09/20/managing-temporary-files-with-systemd-tmpfiles-on-rhel7/
#  * man 5 tmpfiles.d
#
# Notes: 
#
#  * You can't avoid setting the mode, user, and group when aging off files
#    within a directory using systemd-tmpfiles' `d` line.
#  * If a `d` line's path doesn't exist, systemd-tmpfiles will create it.
#  * So: MAKE SURE the settings below are correct for your version of PuppetDB!
#
d /opt/puppetlabs/server/data/puppetdb/mq/discard/replace-facts/ 0750 pe-puppetdb pe-puppetdb 3d