Pin puppetlabs-concat fixture to 1.0.0

Change-Id: I70bf489ca1f9873a749fb8774c775fe46610b7de
(cherry picked from commit 3a16f56b0dce87df7358fe8f38c623a32a0daa38)
Revert "Fix compatibility with latest puppetlabs-concat"

This fix broke everything. Lets revert it.

This reverts commit 23cc3616cea78b8431181af748a1827add18974f.

Change-Id: I9ce82c2e8f65606fbcedb4e2a4b37bc81edc5656
(cherry picked from commit e2e39f0edee69874818118a2e2c6941336c8ea93)