VMware: virt rescue method now supports objects

Commit a37a96fd13b933123e80ad24e37fc37d73c16059 ensured
that the compute API and manager are now getting objects
for the rescue method.

This patch adds support to the virt driver code.

Change-Id: Id7fca437f8470ee483ec3683211766095b293ebf
Merge "VMware: virt rescue method now supports objects"