JCLOUDS-199. CloudStack live tests against ACS 4.2 simulator cleanup.

- ACS 4.x doesn't like taking SSH pub keys from the filesystem, so
    generate them on the fly.
- vm.getDisplayName() can be null now.
- Add new possible resource limit types.
- Default to looking template=osFamily=CENTOS, since that's the only
    template guaranteed to be there in the simulator.
- Use adminJobComplete instead of jobComplete in admin tests
- Accept capacity/usage/etc of 0.
- Premium configuration category not present in ACS.
- Sleep a bit between deleting a domain and verifying it's not there
    any more. Also expect an IllegalStateException.
- Given that there are issues deleting zones at the moment (through
    the UI, too), use a different zone for pod and zone tests.

Still failing tests:
- pretty much everything that creates a VM and expects to log into it,
    but that's simulator-specific.
- Zone deletion, due to a bug in ACS, apparently.
- Registering and creating templates
- creating volumes from snapshots, and attaching volumes