VMware: Add utility method to retrieve remote objects

Added a utility method that can retrieve the properties of objects
that are within a parent object in the vCenter server. With
existing utility methods, this is not possible without making multiple
api calls.

This patch partially re-adds the changes reverted by change-id
Ia3a6e3f502282d44473d4908f68d71a97167e85f.

Change-Id: I9a461b2cdde906d4f25af513b4c0410b35e82209
Merge "VMware: Add utility method to retrieve remote objects"