BZ#836161 - Remove preDeleteRename().

Change-Id: I2452594c701eb9c3ccbab7de92e8fca69f033074
Signed-off-by: Eduardo <ewarszaw@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/8508
Reviewed-by: Dan Kenigsberg <danken@redhat.com>
Tested-by: Dan Kenigsberg <danken@redhat.com>