cqlsh: flush capture output after every command. Patch by paul cannon, reviewed by brandonwilliams for CASSANDRA-4073
cqlsh: flush capture output after every command.
Patch by paul cannon, reviewed by brandonwilliams for CASSANDRA-4073

LatencyUtils/cassandra-stress2,sivikt/cassandra,sedulam/CASSANDRA-12201,snazy/cassandra,DavidHerzogTU-Berlin/cassandraToRun,yonglehou/cassandra,hhorii/cassandra,rackerlabs/cloudmetrics-cassandra,sriki77/cassandra,tongjixianing/projects,Instagram/cassandra,yangzhe1991/cassandra,likaiwalkman/cassandra,modempachev4/kassandra,rogerchina/cassandra,jrwest/cassandra,belliottsmith/cassandra,WorksApplications/cassandra,kangkot/stratio-cassandra,dongjiaqiang/cassandra,jeffjirsa/cassandra,szhou1234/cassandra,lalithsuresh/cassandra-c3,chbatey/cassandra-1,mt0803/cassandra,asias/cassandra,pauloricardomg/cassandra,DICL/cassandra,bcoverston/cassandra,nlalevee/cassandra,vramaswamy456/cassandra,heiko-braun/cassandra,asias/cassandra,jrwest/cassandra,guard163/cassandra,DikangGu/cassandra,rdio/cassandra,DICL/cassandra,WorksApplications/cassandra,sayanh/ViewMaintenanceCassandra,EnigmaCurry/cassandra,Jaumo/cassandra,yonglehou/cassandra,ollie314/cassandra,hengxin/cassandra,strapdata/cassandra,Jollyplum/cassandra,jasonwee/cassandra,kangkot/stratio-cassandra,codefollower/Cassandra-Research,ibmsoe/cassandra,shawnkumar/cstargraph,guanxi55nba/db-improvement,scaledata/cassandra,yanbit/cassandra,helena/cassandra,rackerlabs/cloudmetrics-cassandra,sbtourist/cassandra,JeremiahDJordan/cassandra,sivikt/cassandra,RyanMagnusson/cassandra,blambov/cassandra,blerer/cassandra,bcoverston/apache-hosted-cassandra,JeremiahDJordan/cassandra,jeromatron/cassandra,leomrocha/cassandra,sayanh/ViewMaintenanceSupport,chbatey/cassandra-1,Jollyplum/cassandra,hhorii/cassandra,nutbunnies/cassandra,boneill42/cassandra,bpupadhyaya/cassandra,MasahikoSawada/cassandra,aweisberg/cassandra,blerer/cassandra,MasahikoSawada/cassandra,caidongyun/cassandra,stef1927/cassandra,sayanh/ViewMaintenanceSupport,shawnkumar/cstargraph,krummas/cassandra,tjake/cassandra,caidongyun/cassandra,Bj0rnen/cassandra,HidemotoNakada/cassandra-udf,weipinghe/cassandra,heiko-braun/cassandra,bpupadhyaya/cassandra,cooldoger/cassandra,darach/cassandra,matthewtt/cassandra_read,rdio/cassandra,dprguiuc/Cassandra-Wasef,shawnkumar/cstargraph,mkjellman/cassandra,jkni/cassandra,bmel/cassandra,pkdevbox/cassandra,mt0803/cassandra,jeffjirsa/cassandra,darach/cassandra,nakomis/cassandra,weideng1/cassandra,iamaleksey/cassandra,tommystendahl/cassandra,josh-mckenzie/cassandra,ben-manes/cassandra,blambov/cassandra,jasonstack/cassandra,tongjixianing/projects,mambocab/cassandra,WorksApplications/cassandra,yangzhe1991/cassandra,knifewine/cassandra,pauloricardomg/cassandra,lalithsuresh/cassandra-c3,jeromatron/cassandra,michaelsembwever/cassandra,mike-tr-adamson/cassandra,miguel0afd/cassandra-cqlMod,adejanovski/cassandra,helena/cassandra,pcmanus/cassandra,strapdata/cassandra,lalithsuresh/cassandra-c3,ifesdjeen/cassandra,sharvanath/cassandra,instaclustr/cassandra,miguel0afd/cassandra-cqlMod,bmel/cassandra,ben-manes/cassandra,joesiewert/cassandra,strapdata/cassandra,nitsanw/cassandra,Instagram/cassandra,ifesdjeen/cassandra,aureagle/cassandra,pallavi510/cassandra,spodkowinski/cassandra,clohfink/cassandra,MasahikoSawada/cassandra,leomrocha/cassandra,pkdevbox/cassandra,fengshao0907/Cassandra-Research,rmarchei/cassandra,michaelsembwever/cassandra,sayanh/ViewMaintenanceCassandra,carlyeks/cassandra,aboudreault/cassandra,boneill42/cassandra,Stratio/cassandra,hengxin/cassandra,aureagle/cassandra,Jollyplum/cassandra,aboudreault/cassandra,krummas/cassandra,snazy/cassandra,joesiewert/cassandra,whitepages/cassandra,scylladb/scylla-tools-java,swps/cassandra,mheffner/cassandra-1,blerer/cassandra,exoscale/cassandra,belliottsmith/cassandra,bdeggleston/cassandra,nutbunnies/cassandra,DavidHerzogTU-Berlin/cassandra,nitsanw/cassandra,mambocab/cassandra,mkjellman/cassandra,jrwest/cassandra,cooldoger/cassandra,beobal/cassandra,ptuckey/cassandra,thelastpickle/cassandra,Jaumo/cassandra,jsanda/cassandra,aweisberg/cassandra,emolsson/cassandra,chbatey/cassandra-1,WorksApplications/cassandra,asias/cassandra,juiceblender/cassandra,dprguiuc/Cassandra-Wasef,nutbunnies/cassandra,bcoverston/cassandra,rmarchei/cassandra,scylladb/scylla-tools-java,blambov/cassandra,rmarchei/cassandra,iamaleksey/cassandra,spodkowinski/cassandra,Bj0rnen/cassandra,sedulam/CASSANDRA-12201,krummas/cassandra,aweisberg/cassandra,jeffjirsa/cassandra,wreda/cassandra,christian-esken/cassandra,jeromatron/cassandra,chaordic/cassandra,michaelsembwever/cassandra,pallavi510/cassandra,ibmsoe/cassandra,vaibhi9/cassandra,a-buck/cassandra,bcoverston/apache-hosted-cassandra,Stratio/stratio-cassandra,yanbit/cassandra,jasonwee/cassandra,jeffjirsa/cassandra,weideng1/cassandra,gdusbabek/cassandra,thobbs/cassandra,yukim/cassandra,kangkot/stratio-cassandra,pauloricardomg/cassandra,regispl/cassandra,mshuler/cassandra,apache/cassandra,boneill42/cassandra,yhnishi/cassandra,snazy/cassandra,clohfink/cassandra,chaordic/cassandra,yukim/cassandra,iburmistrov/Cassandra,pthomaid/cassandra,rackerlabs/cloudmetrics-cassandra,scaledata/cassandra,ptnapoleon/cassandra,wreda/cassandra,yonglehou/cassandra,vaibhi9/cassandra,Bj0rnen/cassandra,iamaleksey/cassandra,jasonwee/cassandra,juiceblender/cassandra,beobal/cassandra,fengshao0907/cassandra-1,mshuler/cassandra,whitepages/cassandra,jrwest/cassandra,kgreav/cassandra,jsanda/cassandra,pkdevbox/cassandra,sriki77/cassandra,mike-tr-adamson/cassandra,dkua/cassandra,leomrocha/cassandra,chaordic/cassandra,project-zerus/cassandra,ejankan/cassandra,pcn/cassandra-1,AtwooTM/cassandra,bcoverston/apache-hosted-cassandra,mgmuscari/cassandra-cdh4,yanbit/cassandra,cooldoger/cassandra,mashuai/Cassandra-Research,carlyeks/cassandra,driftx/cassandra,ptuckey/cassandra,tjake/cassandra,ibmsoe/cassandra,pallavi510/cassandra,mt0803/cassandra,josh-mckenzie/cassandra,project-zerus/cassandra,swps/cassandra,mheffner/cassandra-1,apache/cassandra,fengshao0907/Cassandra-Research,gdusbabek/cassandra,emolsson/cassandra,fengshao0907/cassandra-1,strapdata/cassandra,DavidHerzogTU-Berlin/cassandra,sluk3r/cassandra,weideng1/cassandra,mheffner/cassandra-1,Stratio/cassandra,belliottsmith/cassandra,pofallon/cassandra,michaelsembwever/cassandra,ollie314/cassandra,snazy/cassandra,blerer/cassandra,sbtourist/cassandra,jasobrown/cassandra,jbellis/cassandra,Stratio/cassandra,pofallon/cassandra,sluk3r/cassandra,taigetco/cassandra_read,thobbs/cassandra,Stratio/stratio-cassandra,tjake/cassandra,kgreav/cassandra,ben-manes/cassandra,aureagle/cassandra,dkua/cassandra,aarushi12002/cassandra,GabrielNicolasAvellaneda/cassandra,taigetco/cassandra_read,jasobrown/cassandra,guanxi55nba/db-improvement,yhnishi/cassandra,AtwooTM/cassandra,bmel/cassandra,kgreav/cassandra,RyanMagnusson/cassandra,knifewine/cassandra,macintoshio/cassandra,iamaleksey/cassandra,nvoron23/cassandra,knifewine/cassandra,mike-tr-adamson/cassandra,kgreav/cassandra,beobal/cassandra,jbellis/cassandra,mshuler/cassandra,macintoshio/cassandra,fengshao0907/Cassandra-Research,phact/cassandra,christian-esken/cassandra,jasobrown/cassandra,codefollower/Cassandra-Research,adelapena/cassandra,DikangGu/cassandra,michaelmior/cassandra,exoscale/cassandra,aboudreault/cassandra,regispl/cassandra,apache/cassandra,hengxin/cassandra,nlalevee/cassandra,tongjixianing/projects,stef1927/cassandra,EnigmaCurry/cassandra,guanxi55nba/key-value-store,driftx/cassandra,nvoron23/cassandra,belliottsmith/cassandra,instaclustr/cassandra,blambov/cassandra,dongjiaqiang/cassandra,adejanovski/cassandra,heiko-braun/cassandra,modempachev4/kassandra,joesiewert/cassandra,bdeggleston/cassandra,nakomis/cassandra,sbtourist/cassandra,hhorii/cassandra,adejanovski/cassandra,LatencyUtils/cassandra-stress2,sedulam/CASSANDRA-12201,darach/cassandra,tommystendahl/cassandra,Instagram/cassandra,pcn/cassandra-1,regispl/cassandra,rdio/cassandra,emolsson/cassandra,vramaswamy456/cassandra,nakomis/cassandra,ejankan/cassandra,sivikt/cassandra,scylladb/scylla-tools-java,pthomaid/cassandra,matthewtt/cassandra_read,aarushi12002/cassandra,instaclustr/cassandra,xiongzheng/Cassandra-Research,instaclustr/cassandra,yukim/cassandra,xiongzheng/Cassandra-Research,michaelmior/cassandra,jbellis/cassandra,clohfink/cassandra,aweisberg/cassandra,sluk3r/cassandra,Imran-C/cassandra,HidemotoNakada/cassandra-udf,gdusbabek/cassandra,HidemotoNakada/cassandra-udf,pauloricardomg/cassandra,scylladb/scylla-tools-java,weipinghe/cassandra,kangkot/stratio-cassandra,michaelmior/cassandra,stef1927/cassandra,RyanMagnusson/cassandra,mgmuscari/cassandra-cdh4,mashuai/Cassandra-Research,newrelic-forks/cassandra,GabrielNicolasAvellaneda/cassandra,jasobrown/cassandra,newrelic-forks/cassandra,ejankan/cassandra,szhou1234/cassandra,taigetco/cassandra_read,mike-tr-adamson/cassandra,josh-mckenzie/cassandra,driftx/cassandra,nlalevee/cassandra,juiceblender/cassandra,mambocab/cassandra,adelapena/cassandra,helena/cassandra,ptnapoleon/cassandra,DavidHerzogTU-Berlin/cassandraToRun,thelastpickle/cassandra,bpupadhyaya/cassandra,spodkowinski/cassandra,beobal/cassandra,szhou1234/cassandra,jkni/cassandra,mashuai/Cassandra-Research,pcn/cassandra-1,bcoverston/cassandra,cooldoger/cassandra,christian-esken/cassandra,iburmistrov/Cassandra,Instagram/cassandra,DICL/cassandra,a-buck/cassandra,guanxi55nba/key-value-store,wreda/cassandra,mgmuscari/cassandra-cdh4,swps/cassandra,newrelic-forks/cassandra,iburmistrov/Cassandra,sriki77/cassandra,weipinghe/cassandra,phact/cassandra,sharvanath/cassandra,yukim/cassandra,exoscale/cassandra,codefollower/Cassandra-Research,tommystendahl/cassandra,yhnishi/cassandra,jsanda/cassandra,dongjiaqiang/cassandra,DikangGu/cassandra,fengshao0907/cassandra-1,jasonstack/cassandra,dkua/cassandra,sayanh/ViewMaintenanceCassandra,stef1927/cassandra,spodkowinski/cassandra,LatencyUtils/cassandra-stress2,Imran-C/cassandra,rogerchina/cassandra,jasonstack/cassandra,adelapena/cassandra,dprguiuc/Cassandra-Wasef,macintoshio/cassandra,yangzhe1991/cassandra,vaibhi9/cassandra,aarushi12002/cassandra,tommystendahl/cassandra,pcmanus/cassandra,Stratio/stratio-cassandra,DavidHerzogTU-Berlin/cassandraToRun,thelastpickle/cassandra,bdeggleston/cassandra,ifesdjeen/cassandra,nitsanw/cassandra,mkjellman/cassandra,JeremiahDJordan/cassandra,pcmanus/cassandra,adelapena/cassandra,josh-mckenzie/cassandra,pofallon/cassandra,xiongzheng/Cassandra-Research,juiceblender/cassandra,qinjin/mdtc-cassandra,ollie314/cassandra,vramaswamy456/cassandra,project-zerus/cassandra,qinjin/mdtc-cassandra,Jaumo/cassandra,bcoverston/cassandra,sharvanath/cassandra,AtwooTM/cassandra,qinjin/mdtc-cassandra,thobbs/cassandra,carlyeks/cassandra,Imran-C/cassandra,scaledata/cassandra,phact/cassandra,guard163/cassandra,szhou1234/cassandra,caidongyun/cassandra,apache/cassandra,thelastpickle/cassandra,guard163/cassandra,modempachev4/kassandra,DavidHerzogTU-Berlin/cassandra,ifesdjeen/cassandra,Stratio/stratio-cassandra,mkjellman/cassandra,miguel0afd/cassandra-cqlMod,whitepages/cassandra,ptnapoleon/cassandra,guanxi55nba/key-value-store,krummas/cassandra,mshuler/cassandra,jkni/cassandra,Stratio/stratio-cassandra,guanxi55nba/db-improvement,pthomaid/cassandra,driftx/cassandra,rogerchina/cassandra,a-buck/cassandra,tjake/cassandra,bdeggleston/cassandra,nvoron23/cassandra,GabrielNicolasAvellaneda/cassandra,EnigmaCurry/cassandra,likaiwalkman/cassandra,clohfink/cassandra,matthewtt/cassandra_read,ptuckey/cassandra,likaiwalkman/cassandra,kangkot/stratio-cassandra