When an object is deleted, send delete for all its refs in one message to ifmap
When an object is deleted, send delete for all its refs in one message to ifmap

Also do the same when an object is updated for all refs that are being deleted
Partial-Bug: 1432735

Change-Id: I08db1e61768517b0b866e1a1106ee75d7fe7c635

JioCloud/contrail-generateDS,JioCloud/contrail-generateDS,varunarya10/contrail-generateDS,vpramo/contrail-generateDS,JioCloud/contrail-generateDS,varunarya10/contrail-generateDS,varunarya10/contrail-generateDS,vpramo/contrail-generateDS,varunarya10/contrail-generateDS,vpramo/contrail-generateDS,JioCloud/contrail-generateDS,vpramo/contrail-generateDS,varunarya10/contrail-generateDS,JioCloud/contrail-generateDS,vpramo/contrail-generateDS