Find a Virtual Machine by UUID

Demonstrates finding a single virtual machine by a unique
UUID. You should note that there is a FindAllByUuid which
returns a list of all things found with the UUID supplied.

Related to: https://github.com/vmware/pyvmomi/issues/110
Merge pull request #108 from hartsock/master

Find a Virtual Machine by UUID
Revert "Find a Virtual Machine by UUID"
Merge pull request #109 from vmware/revert-108-master

Revert "Find a Virtual Machine by UUID"
Merge pull request #110 from hartsock/master

Find a Virtual Machine by UUID