Handle the following sequence of events correctly in Agent UVE code
--VM Disassociation from VMI
--VM Deletion
--VM Addition
--VM Reassociation to same VMI
(Because VM gets deleted and re-added, store VM UUID instead of VM pointer as metadata on interface entry)

Change-Id: I453c1eec392136c9a437c326e06f2dfd7defd765
Merge "Handle the following sequence of events correctly in Agent UVE code --VM Disassociation from VMI --VM Deletion --VM Addition --VM Reassociation to same VMI (Because VM gets deleted and re-added, store VM UUID instead of VM pointer as metadata on interface entry)"