Add govuk-jenkinslib to CI
Add govuk-jenkinslib to CI

In a strange paradox I'm adding the library that we use for our
Jenkinsfile's to our CI so I can test adding the library in it's own
Jenkinsfile.

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