All jumpbox vhosts need the environment cert

All the vhosts on the jumbpox, for management services, use environment
specific domain names (*.<environment>.performance.service.gov.uk) and
never the public domain names (*.performance.service.gov.uk). This means
that we need to ensure they always have the environment cert.
Merge pull request #491 from alphagov/public-and-env-ssl-keys

All jumpbox vhosts need the environment cert