registry : Convert Beaker tests to Beaker-rspec

The current acceptance tests are written in straight beaker, however the preferred method would be to use beaker-rspec.

This ticket is to change the acceptance test suite to the new syntax.

• This will involve moving the test files to a new location
• Renaming the tests files with a _spec.rb suffix
• Possibly moving test fixture support helpers
• Removing the beaker rake task shim so that the real rake task is run.