Upload

Adding an example that shows how to upload a file to an arbitrary datastore. Other pull requests, because I fail at git( https://github.com/vmware/pyvmomi-community-samples/pull/77, https://github.com/vmware/pyvmomi-community-samples/pull/78, and https://github.com/vmware/pyvmomi-community-samples/pull/76), and this fixes issue https://github.com/vmware/pyvmomi-community-samples/issues/38