Normalize Gemfile & 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 change is also intended to normalize the Gemfile for all stackforge
puppet modules.  This should facilitate pinning gem versions when
releasing new stable branches, since the same diff can be used for all
repos.

Conflicts:
  Gemfile

Change-Id: Id8595fc2fd8b4e4bec4ba60d85696983fb632a18
Partial-Bug: #1326034
(cherry picked from commit 33798065544f3e23508c12d8a3bda1db09980ba3)