A copy of the filter used for our Gitea farm, this same activity has
been showing up on our tarballs.opendev.org site as well which is
consuming available connection slots for all vhosts on the static
server.
This is implemented as a macro so that it can be included into
additional vhosts, and put into a separate role so that it can be
added to all playbooks which need it. A subsequent change will add
it to the Gitea servers, eliminating the redundant copy there.
Change-Id: Ic2020b753076209f7708f76744fdf746bf933bd9
