Get entropy from /dev/urandom for unit tests
Get entropy from /dev/urandom for unit tests

patch by Ariel Weisberg; reviewed by Aleksey Yeschenko for
CASSANDRA-9581

whitepages/cassandra,yanbit/cassandra,scylladb/scylla-tools-java,regispl/cassandra,michaelmior/cassandra,jasonstack/cassandra,guard163/cassandra,sharvanath/cassandra,pthomaid/cassandra,likaiwalkman/cassandra,aarushi12002/cassandra,michaelsembwever/cassandra,xiongzheng/Cassandra-Research,mike-tr-adamson/cassandra,yangzhe1991/cassandra,sedulam/CASSANDRA-12201,helena/cassandra,bpupadhyaya/cassandra,adejanovski/cassandra,mambocab/cassandra,yangzhe1991/cassandra,jasonstack/cassandra,adejanovski/cassandra,instaclustr/cassandra,guard163/cassandra,pthomaid/cassandra,newrelic-forks/cassandra,blerer/cassandra,likaiwalkman/cassandra,blerer/cassandra,a-buck/cassandra,Imran-C/cassandra,josh-mckenzie/cassandra,hengxin/cassandra,sivikt/cassandra,belliottsmith/cassandra,mshuler/cassandra,Instagram/cassandra,chbatey/cassandra-1,emolsson/cassandra,hhorii/cassandra,macintoshio/cassandra,pkdevbox/cassandra,ejankan/cassandra,ollie314/cassandra,RyanMagnusson/cassandra,belliottsmith/cassandra,driftx/cassandra,rmarchei/cassandra,ben-manes/cassandra,jrwest/cassandra,pcn/cassandra-1,krummas/cassandra,clohfink/cassandra,vramaswamy456/cassandra,bcoverston/cassandra,blambov/cassandra,nutbunnies/cassandra,yukim/cassandra,jeffjirsa/cassandra,jasonwee/cassandra,juiceblender/cassandra,bdeggleston/cassandra,whitepages/cassandra,aweisberg/cassandra,vramaswamy456/cassandra,likaiwalkman/cassandra,tongjixianing/projects,beobal/cassandra,instaclustr/cassandra,sivikt/cassandra,guard163/cassandra,yukim/cassandra,pofallon/cassandra,strapdata/cassandra,yangzhe1991/cassandra,michaelsembwever/cassandra,christian-esken/cassandra,rogerchina/cassandra,ben-manes/cassandra,krummas/cassandra,exoscale/cassandra,jasobrown/cassandra,bmel/cassandra,MasahikoSawada/cassandra,pkdevbox/cassandra,swps/cassandra,ptnapoleon/cassandra,yonglehou/cassandra,jrwest/cassandra,aweisberg/cassandra,juiceblender/cassandra,hhorii/cassandra,MasahikoSawada/cassandra,nitsanw/cassandra,Jaumo/cassandra,Jaumo/cassandra,exoscale/cassandra,caidongyun/cassandra,whitepages/cassandra,yonglehou/cassandra,DikangGu/cassandra,GabrielNicolasAvellaneda/cassandra,newrelic-forks/cassandra,hengxin/cassandra,codefollower/Cassandra-Research,szhou1234/cassandra,iamaleksey/cassandra,fengshao0907/cassandra-1,pauloricardomg/cassandra,michaelmior/cassandra,scylladb/scylla-tools-java,nitsanw/cassandra,clohfink/cassandra,tommystendahl/cassandra,spodkowinski/cassandra,codefollower/Cassandra-Research,mkjellman/cassandra,weipinghe/cassandra,mkjellman/cassandra,ejankan/cassandra,joesiewert/cassandra,josh-mckenzie/cassandra,adelapena/cassandra,scaledata/cassandra,rdio/cassandra,jasonwee/cassandra,driftx/cassandra,aboudreault/cassandra,vramaswamy456/cassandra,strapdata/cassandra,kgreav/cassandra,rogerchina/cassandra,modempachev4/kassandra,dongjiaqiang/cassandra,pauloricardomg/cassandra,fengshao0907/Cassandra-Research,bcoverston/cassandra,jeromatron/cassandra,snazy/cassandra,blerer/cassandra,pcmanus/cassandra,jasonstack/cassandra,bmel/cassandra,strapdata/cassandra,ifesdjeen/cassandra,apache/cassandra,bcoverston/cassandra,aureagle/cassandra,adelapena/cassandra,hhorii/cassandra,boneill42/cassandra,mt0803/cassandra,mike-tr-adamson/cassandra,michaelsembwever/cassandra,kgreav/cassandra,Jollyplum/cassandra,jasobrown/cassandra,ptnapoleon/cassandra,rdio/cassandra,sharvanath/cassandra,mt0803/cassandra,mheffner/cassandra-1,AtwooTM/cassandra,phact/cassandra,krummas/cassandra,macintoshio/cassandra,jbellis/cassandra,ifesdjeen/cassandra,a-buck/cassandra,tommystendahl/cassandra,xiongzheng/Cassandra-Research,aboudreault/cassandra,dongjiaqiang/cassandra,WorksApplications/cassandra,thobbs/cassandra,rogerchina/cassandra,stef1927/cassandra,josh-mckenzie/cassandra,szhou1234/cassandra,szhou1234/cassandra,adelapena/cassandra,spodkowinski/cassandra,yanbit/cassandra,carlyeks/cassandra,mkjellman/cassandra,instaclustr/cassandra,christian-esken/cassandra,bdeggleston/cassandra,mheffner/cassandra-1,ejankan/cassandra,mshuler/cassandra,thelastpickle/cassandra,szhou1234/cassandra,ptuckey/cassandra,stef1927/cassandra,vaibhi9/cassandra,mike-tr-adamson/cassandra,pcmanus/cassandra,weipinghe/cassandra,phact/cassandra,cooldoger/cassandra,jeromatron/cassandra,beobal/cassandra,scylladb/scylla-tools-java,mkjellman/cassandra,macintoshio/cassandra,DikangGu/cassandra,carlyeks/cassandra,ptuckey/cassandra,pcmanus/cassandra,darach/cassandra,tongjixianing/projects,caidongyun/cassandra,wreda/cassandra,fengshao0907/Cassandra-Research,boneill42/cassandra,joesiewert/cassandra,cooldoger/cassandra,wreda/cassandra,jeffjirsa/cassandra,WorksApplications/cassandra,beobal/cassandra,apache/cassandra,darach/cassandra,stef1927/cassandra,thobbs/cassandra,jasobrown/cassandra,regispl/cassandra,pofallon/cassandra,yukim/cassandra,aarushi12002/cassandra,pcn/cassandra-1,WorksApplications/cassandra,sedulam/CASSANDRA-12201,rdio/cassandra,helena/cassandra,mheffner/cassandra-1,GabrielNicolasAvellaneda/cassandra,jeromatron/cassandra,ollie314/cassandra,michaelmior/cassandra,blambov/cassandra,pkdevbox/cassandra,adejanovski/cassandra,boneill42/cassandra,sluk3r/cassandra,pauloricardomg/cassandra,ptuckey/cassandra,thelastpickle/cassandra,michaelsembwever/cassandra,vaibhi9/cassandra,vaibhi9/cassandra,bcoverston/cassandra,apache/cassandra,newrelic-forks/cassandra,jasobrown/cassandra,weideng1/cassandra,tjake/cassandra,Instagram/cassandra,beobal/cassandra,iamaleksey/cassandra,snazy/cassandra,sharvanath/cassandra,aureagle/cassandra,WorksApplications/cassandra,bpupadhyaya/cassandra,clohfink/cassandra,AtwooTM/cassandra,scaledata/cassandra,aureagle/cassandra,ptnapoleon/cassandra,weideng1/cassandra,knifewine/cassandra,belliottsmith/cassandra,tongjixianing/projects,yukim/cassandra,blambov/cassandra,bmel/cassandra,belliottsmith/cassandra,ifesdjeen/cassandra,Jollyplum/cassandra,emolsson/cassandra,instaclustr/cassandra,darach/cassandra,DikangGu/cassandra,swps/cassandra,fengshao0907/Cassandra-Research,hengxin/cassandra,mike-tr-adamson/cassandra,jrwest/cassandra,adelapena/cassandra,strapdata/cassandra,cooldoger/cassandra,jrwest/cassandra,iamaleksey/cassandra,apache/cassandra,tommystendahl/cassandra,bpupadhyaya/cassandra,sluk3r/cassandra,rmarchei/cassandra,aweisberg/cassandra,nitsanw/cassandra,jbellis/cassandra,spodkowinski/cassandra,Instagram/cassandra,pofallon/cassandra,mshuler/cassandra,AtwooTM/cassandra,tjake/cassandra,krummas/cassandra,scylladb/scylla-tools-java,kgreav/cassandra,a-buck/cassandra,bdeggleston/cassandra,ifesdjeen/cassandra,nutbunnies/cassandra,fengshao0907/cassandra-1,blerer/cassandra,driftx/cassandra,xiongzheng/Cassandra-Research,ben-manes/cassandra,pauloricardomg/cassandra,bdeggleston/cassandra,driftx/cassandra,Instagram/cassandra,chbatey/cassandra-1,snazy/cassandra,sluk3r/cassandra,fengshao0907/cassandra-1,thelastpickle/cassandra,kgreav/cassandra,nutbunnies/cassandra,thelastpickle/cassandra,clohfink/cassandra,RyanMagnusson/cassandra,exoscale/cassandra,regispl/cassandra,aweisberg/cassandra,juiceblender/cassandra,sedulam/CASSANDRA-12201,yhnishi/cassandra,GabrielNicolasAvellaneda/cassandra,Imran-C/cassandra,carlyeks/cassandra,blambov/cassandra,chbatey/cassandra-1,pcn/cassandra-1,juiceblender/cassandra,stef1927/cassandra,MasahikoSawada/cassandra,modempachev4/kassandra,Jollyplum/cassandra,tommystendahl/cassandra,yhnishi/cassandra,yhnishi/cassandra,helena/cassandra,christian-esken/cassandra,scaledata/cassandra,jasonwee/cassandra,wreda/cassandra,phact/cassandra,RyanMagnusson/cassandra,aboudreault/cassandra,mshuler/cassandra,modempachev4/kassandra,aarushi12002/cassandra,ollie314/cassandra,rmarchei/cassandra,Imran-C/cassandra,tjake/cassandra,jbellis/cassandra,knifewine/cassandra,weideng1/cassandra,sivikt/cassandra,emolsson/cassandra,josh-mckenzie/cassandra,yonglehou/cassandra,weipinghe/cassandra,jeffjirsa/cassandra,snazy/cassandra,mt0803/cassandra,spodkowinski/cassandra,swps/cassandra,thobbs/cassandra,dongjiaqiang/cassandra,mambocab/cassandra,mambocab/cassandra,jeffjirsa/cassandra,yanbit/cassandra,knifewine/cassandra,caidongyun/cassandra,Jaumo/cassandra,pthomaid/cassandra,cooldoger/cassandra,tjake/cassandra,codefollower/Cassandra-Research,iamaleksey/cassandra,joesiewert/cassandra