Symbiosis: Missing error document handling for non-mass-hosted domains
Imported from https://www.github.com/BytemarkHosting/symbiosis/issues/79
Relating to https://www.github.com/BytemarkHosting/symbiosis/issues/63 - the default site is configured using ErrorDocument in zz-masshosting.conf and zz-masshosting.ssl.conf, but is not in the template for other sites.
When I installed symbiosis-stretch on a new virtualmachine it created /etc/apache2/sites-enabled/symbiosis-stretch.work.telyn.uk0.bigv.io.conf. I suspect this is unintended and possibly to do with how we do SSL now?