Feature request: return vm's uuid, get_vm_by_uuid

This is two related requets. Since most other systems rely on the VM's uuid, I 
propose:

1. Have a function or flag on get_registered_vms that returns the uuid of a vm 
(..., returnUUID=False). I do see that this information is available under 
VirtualMachineConfigSummary_Def.

2. Implement a get_vm_by_uuid function.

Additionally, as other object (such as vcenter) have a uuid, start looking at 
how to expose this information and select object by uuid.

Original issue reported on code.google.com by j...@hogenmiller.net on 25 Sep 2012 at 10:11

DiegoSanjuan / pysphere

Feature request: return vm's uuid, get_vm_by_uuid #24