Explicitly pass in parameters from s_jenkins class
Explicitly pass in parameters from s_jenkins class

To make it less confusing, explicitly pass in parameters for the
s_jenkins node class in the same way that we are for the
govuk_ci::master class.

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