This impelements mirrors to live in the opendev.org namespace. The
implementation is Ansible native for deployment on a Bionic node.
The hostname prefix remains the same (mirrorXX.region.provider.) but
the groups.yaml splits the opendev.org mirrors into a separate group.
The matches in the puppet group are also updated so to not run puppet
on the hosts.
The kerberos and openafs client parts do not need any updating and
works on the Bionic host.
The hosts are setup to provision certificates for themselves from
letsencrypt. Note we've added a new handler for mirror nodes to use
that restarts apache on certificate issue/renewal.
The new "mirror" role is a port of the existing puppet mirror.pp. It
installs apache, sets up some modules, makes some symlinks, sets up a
cleanup cron job and installs the apache vhost configuration.
The vhost configuration is also ported from the extant puppet. It is
simplified somewhat; but the biggest change is that we have extracted
the main port 80 configuration into a macro which is applied to both
port 80 and 443; i.e. the host will have SSL support. The other ports
are left alone for now, but can be updated in due course.
Thus we should be able to CNAME the existing mirrors to new nodes, and
any existing http access can continue. We can update our mirror setup
scripts to point to https resources as appropriate.
Change-Id: Iec576d631dd5b02f6b9fb445ee600be060f9cf1e
670107045a