Also: removed unused method; some property modernisation; removed class
LiveMigrateOptionsVmMapping which was rather complicating things.
Signed-off-by: Konstantina Chremmou <konstantina.chremmou@citrix.com>
prevent them from being serialised alongside the API properties. This will also
be useful for moving the API bindings out of XenModel.
Signed-off-by: Konstantina Chremmou <konstantina.chremmou@citrix.com>