core: create default disk profile for attached SD

Disk profile wasn't created for 'old' storage domain that
is attached to 3.5 data center.

Also added compensation support for disk profile.

Change-Id: Ic59d6f38096fb5e20fee5b9b4705b4603fdf0d4f
Bug-Url: https://bugzilla.redhat.com/1146073
Signed-off-by: Gilad Chaplik <gchaplik@redhat.com>