core: persist disk image parameters for live migration

DiskImage's Disk Profile and Quota wasn't updated.

Change-Id: I0d6acdd7e8567294d489d1916ede164683941ef7
Bug-Url: https://bugzilla.redhat.com/1145694
Signed-off-by: Gilad Chaplik <gchaplik@redhat.com>
(cherry picked from commit 2df230f0245e693455e7fc00bfe82157b0180a1e)