Purge old router_routes.conf file
Purge old router_routes.conf file

Renamed in 7d3f6c7. Purge the old file to save any confusion on existing
machines. This commit can be reverted later.

alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet