Reload the entity state. Clients only need to call this method
if they changed some external state that affects the service
without using the Web service interface to perform the change.
For example, hand-editing a virtual machine configuration file
affects the configuration of the associated virtual machine but
the service managing the virtual machine might not monitor the
file for changes. In this case, after such an edit, a client
would call "reload" on the associated virtual machine to ensure
the service and its clients have current data for the
virtual machine.