Remove leavers from Vagrant GPG recipients file
Remove leavers from Vagrant GPG recipients file

Kush and Tim no longer work on GOV.UK. I haven't re-encrypted the one
encrypted credential in `vagrant_credentials.yaml` because it's not a
secret; it's just used as a canary to ensure that Hiera eYAML GPG is
working.

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