use payloads for SECURITY_GROUP BEFORE_DELETE events
use payloads for SECURITY_GROUP BEFORE_DELETE events

This patch switches over to the payload style callbacks for
BEFORE_DELETE events of SECURITY_GROUP resources.

NeutronLibImpact

Change-Id: I44ab8bfd92ece7501793979f8f45eae65f1e7a2c

mahak/neutron,openstack/neutron,openstack/neutron,openstack/neutron,mahak/neutron,mahak/neutron