Description of problem:

Users commonly need to set limits.conf for httpd and qdrouterd. It should be possible to do this via custom-hiera.yaml, so users don't have to manage the files in a one-off way.

Typical settings are:

1. cat /etc/systemd/system/httpd.service.d/limits.conf
   [Service]
   LimitNOFILE=640000

1. cat /etc/systemd/system/qdrouterd.service.d/limits.conf
   [Service]
   LimitNOFILE=301000

NOTE: I would recommend that these files not be created by default, but only if the user requests it via puppet. Some users may set their limits via other means already, and it would cause a lot of confusion if we interfered with that on a default install.

Version-Release number of selected component (if applicable): 6.3.1