Disable broken registry_spec tests

The registry_spec has been broken since we switched to rspec 3

The :pending flag was running the tests, but expecting them to fail. There
seems to be a bug where if there is a failure outside the test,
in our case the before block was silently raising an exception
whil accessing resource_name, the tests would fail as expected but
rspec would return with an exit code of 1

cc @mcquin @opscode/client-engineers