Fix order-dependent test failure in certificate_status/file spec

This test was failing if the SSL indirections had previously been configured as
:ca. The was due to the fact that we are explicitly testing the
certificate_status :file terminus, which depends on the other SSL indirections
using corresponding termini. This spec wasn't appropriately ensuring they were
also set to :file, breaking that precondition, and causing failures.

Reviewed-By: Matt Robinson <matt@puppetlabs.com>