NRPE on bits caches

I3d71bc53 produced:

err: Could not retrieve catalog from remote server: Error 400 on SERVER: Could not find resource 'Class[Nrpe::Packages]' for relationship on 'Nrpe::Check[check_varnishncsa]' on node arsenic.wikimedia.org

I'm hoping this might fix it, analogously to similar inclusions in
mobile and upload.

Change-Id: I12623022108d1037e6e4dda5e7ddacb8adffae4b