Re-enable spec/unit tests for puppet-ceph

A refactor took place in I6d827f7d381fb37516bf78cd9c0ca2570ba258f6
and continued in I59d55f2a7e796087fb614788b76f62d09a13f729.
These commits resulted in puppet-ceph checks being limited to
only lint and syntax. puppet-module-unit-jobs should not had
been left out.

Change-Id: Ica9d52d8c164ef8542cb1033fed99a72b3395395
Merge "Re-enable spec/unit tests for puppet-ceph"