Remove explicit protocol version in cqlsh
Remove explicit protocol version in cqlsh

 patch by Adam Holmberg; reviewed by Mick Semb Wever for CASSANDRA-16508

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