Ensure /srv/backup-assets is owned by correct user
Ensure /srv/backup-assets is owned by correct user

Previously, /srv/backup-assets was owned by the govuk-backup user, but
Duplicity can't mkdir directories within when connecting as the govuk-asset
user in this instance.

Ensure /srv/backup-assets is actually owned by govuk-assets to get around
this problem.

alphagov/govuk_offsitebackups-puppet,alphagov/govuk_offsitebackups-puppet