Live Merge: Explicitly save block job info

When we removed _blockJobs from the VM.status() it had the unfortunate
side effect of causing block job info to not be saved by VM.saveState().
Fix this by explicitly adding it to toSave.

Change-Id: I6175530fe0aed1e00ad02b6a4abe0704c294e45b
Signed-off-by: Adam Litke <alitke@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/29358
Reviewed-by: Federico Simoncelli <fsimonce@redhat.com>
Reviewed-by: Francesco Romani <fromani@redhat.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>