Remove unused integration test data file
Add extra unit test for :Operational omission

to confirm the behaviour when there are no other differences
Add tests for empty pool/virtual_server combos

* VirtualServers cannot be specified without a matching Pool. Test currently
  relies on vCloud telling us this (which is relatively quick and informative)
* Pools can be specified alone, and this is a valid case when setting up a
  LoadBalancer.
* We should be able to clear out a LoadBalancer by specifying no Pools or
  VirtualServers
* In the process, clean up the expectations of pool/virtual_server
  in the schema to match our requirements.