All tests should be using spec_helper

Not every test is utilizing spec_helper.  Clean up tests
so they are consistent with our other openstack tests.
Also, #require_relative allows you to load a file that
is relative to the file containing the #require_relative
statement.  We should update the remaining cookbook
tests to use this.

Change-Id: Iea7e94789629956458a0ec60a10ab8af0d7fae52