Update encryption env vars to reference encryption
Update encryption env vars to reference encryption

This updates the environment variables names to include reference to
encryption.

eg: active_record_primary_key => active_record_encryption_primary_key

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