[#44000493] Omit www_crt and www_key for vagrant
[#44000493] Omit www_crt and www_key for vagrant

www_crt doesn't existing in `development_credentials`. I can't see what use
www_key would be without an associated cert. So I'm omitting both for the
timebeing.

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