Don't use VMware resource pools for organization

This commit removes support for VMware 'resource pool' functionality
entirely, as VMware installations without the DRS feature enabled are
unable to configure or use resource pools.

Also, resource pools should have never been used for organization;
that's what folders are for.
Merge pull request #20 from sschneid/dont_use_resource_pools_for_organization

Don't use VMware resource pools for organization