Revert "Remove SNI workaround from govuk_mirrorer"
Revert "Remove SNI workaround from govuk_mirrorer"

This reverts commit fe8838aab4f39c2c4fc6123c040b087df39a86c0.

For the moment we still need vhosts and ssl certs for both
www-origin.production.alphagov.co.uk and www.gov.uk on the cache-[123]
boxes, so we still need SNI for govuk_mirrorer.

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