Pin tests to rspec < 2.99

Pin to rspec < 2.99 until rspec-puppet officially supports rspec 3.x.
This is to avoid warnings due to deprecated matchers in the
rspec-puppet gem.

This patch also reverts the change of be_false to be_falsey that was
temporarily required for rspec 3 compability.

Partial-Bug: #1326034
Change-Id: I1f7a754cf285c598169059e757c1a905762e2ce0