core: Add unregistered entities to the ovf tar file

Sync the unregistered entities with the existing entities in the setup
to be stored in the OVF_STORE disk.

Change-Id: Icc5fc1c1b704ecbb49fe3d4c2561ec1836093369
Bug-Url: https://bugzilla.redhat.com/1138114
Signed-off-by: Maor Lipchuk <mlipchuk@redhat.com>