redis-benchmark: fix db selection when :rand: feature is used.
redis-benchmark: fix db selection when :rand: feature is used.

enginekit/redis,Cybermaxs/redis,kts12345/redis,nandhanurrevanth/redis,fanxu/redis,StartTheShift/redis-shift,miminus/redis,damy/redis,quangnguyen90/redis,kolonse/redis,kolonse/redis,ScottKaiGu/redis,janeasystems/redis,powerumc/MyRedis_old,Jonavin/redis,ScottKaiGu/redis,oaastest/redis,damy/redis,jqk6/redis,damy/redis,fanxu/redis,jaambee/redis,kolonse/redis,enginekit/redis,enginekit/redis,oaastest/redis,miminus/redis,kolonse/redis,richmonkey/netleveldb,jacklee0810/redis,miminus/redis,ideaar/redis,shanegxxiao/redis,laurencee/redis,erwin00776/redis-2.8-optimize,LittlePeng/redis,janeasystems/redis,jacklee0810/redis,powerumc/MyRedis_old,jaambee/redis,richmonkey/netleveldb,ScottKaiGu/redis,adamweixuan/redis,jaambee/redis,sidsen/redis,jqk6/redis,ideaar/redis,kts12345/redis,quangnguyen90/redis,jacklee0810/redis,liqiang199105/redis,upsoft/redis,adamweixuan/redis,adamweixuan/redis,kolonse/redis,sidsen/redis,ideaar/redis,StartTheShift/redis-shift,powerumc/MyRedis,sidsen/redis,oaastest/redis,crask/redis-cutter,oaastest/redis,erwin00776/redis-2.8-optimize,alpha8/redis,adamweixuan/redis,ScottKaiGu/redis,powerumc/MyRedis,jqk6/redis,crask/redis-cutter,Jonavin/redis,liqiang199105/redis,kts12345/redis,Cybermaxs/redis,upsoft/redis,damy/redis,richmonkey/netleveldb,Cybermaxs/redis,sidsen/redis,kts12345/redis,hanmichael/redis,fanxu/redis,adamweixuan/redis,nandhanurrevanth/redis,nandhanurrevanth/redis,shanegxxiao/redis,liqiang199105/redis,ideaar/redis,enginekit/redis,hanmichael/redis,janeasystems/redis,powerumc/MyRedis_old,nandhanurrevanth/redis,Jonavin/redis,laurencee/redis,StartTheShift/redis-shift,ideaar/redis,Jonavin/redis,upsoft/redis,hanmichael/redis,upsoft/redis,jaambee/redis,miminus/redis,Cybermaxs/redis,upsoft/redis,laurencee/redis,sidsen/redis,janeasystems/redis,alpha8/redis,Cybermaxs/redis,powerumc/MyRedis,LittlePeng/redis,sidsen/redis,fanxu/redis,crask/redis-cutter,enginekit/redis,jqk6/redis,alpha8/redis,jqk6/redis,hanmichael/redis,oaastest/redis,quangnguyen90/redis,shanegxxiao/redis,shanegxxiao/redis,LittlePeng/redis,damy/redis,kts12345/redis,richmonkey/netleveldb,ScottKaiGu/redis,Jonavin/redis,erwin00776/redis-2.8-optimize,laurencee/redis,jacklee0810/redis,alpha8/redis,powerumc/MyRedis_old,miminus/redis,liqiang199105/redis,quangnguyen90/redis,quangnguyen90/redis,jaambee/redis,erwin00776/redis-2.8-optimize,liqiang199105/redis,shanegxxiao/redis,laurencee/redis,nandhanurrevanth/redis,janeasystems/redis,jacklee0810/redis,alpha8/redis,hanmichael/redis