Prepare debian changelog for 4.0-rc2
Prepare debian changelog for 4.0-rc2

jrwest/cassandra,tjake/cassandra,pauloricardomg/cassandra,szhou1234/cassandra,jrwest/cassandra,instaclustr/cassandra,tjake/cassandra,belliottsmith/cassandra,adelapena/cassandra,szhou1234/cassandra,adelapena/cassandra,belliottsmith/cassandra,instaclustr/cassandra,mshuler/cassandra,szhou1234/cassandra,mike-tr-adamson/cassandra,mshuler/cassandra,mike-tr-adamson/cassandra,pauloricardomg/cassandra,thelastpickle/cassandra,instaclustr/cassandra,instaclustr/cassandra,blambov/cassandra,mike-tr-adamson/cassandra,jrwest/cassandra,adelapena/cassandra,belliottsmith/cassandra,adelapena/cassandra,apache/cassandra,thelastpickle/cassandra,szhou1234/cassandra,blambov/cassandra,pauloricardomg/cassandra,mshuler/cassandra,tjake/cassandra,tjake/cassandra,thelastpickle/cassandra,belliottsmith/cassandra,jrwest/cassandra,apache/cassandra,thelastpickle/cassandra,mshuler/cassandra,driftx/cassandra,driftx/cassandra,mike-tr-adamson/cassandra,driftx/cassandra,driftx/cassandra,pauloricardomg/cassandra,blambov/cassandra,apache/cassandra,apache/cassandra,blambov/cassandra