agent: make dns randomization test more reliable
agent: make dns randomization test more reliable

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gression/consul,webhost/consul,AlphaStaxLLC/consul,nvoron23/consul,EasonYi/consul,bodepd/consul,zendesk/consul,keyang512/consul,hashicorp/consul,sfncook/consul,talwai/consul,Thib17/consul,itnihao/consul,tamsky/consul,vamage/consul,Spantree/consul,mckennajones/consul,tempbottle/consul,tomdionysus/consul,pmalmgren/consul,kylemcc/consul,samaitra/consul,youhong316/consul,youhong316/consul,kylemcc/consul,DivyaVavili/consul,Pivotal-Pierre-Delagrave/consul,tamsky/consul,kikitux/consul,sweeneyb/consul,mfischer-zd/consul,krmcbride/consul,lindenlab/consul,curtiszimmerman/consul,wuub/consul,Eagle-X/consul,tomdionysus/consul,webhost/consul,guojianli/consul,mbrukman/consul,ffung/consul,kingland/consul,ryotarai/consul,rhyas/consul,tamsky/consul,itnihao/consul,wuub/consul,marclop/consul,macb/consul,sweeneyb/consul,zeroae/consul,ffung/consul,mfischer-zd/consul,curtiszimmerman/consul,Test-Betta-Inc/upgraded-engine,i0rek/consul,invenfantasy/consul,scalp42/consul,nvoron23/consul,JioCloud/consul,dustinbrown/consul,soundcloud/consul,Spantree/consul,tomdionysus/consul,tempbottle/consul,Test-Betta-Inc/upgraded-engine,wuub/consul,i0rek/consul,leowmjw/consul,ekristen/consul,sweeneyb/consul,marclop/consul,tshak/consul,jovandeginste/consul,webhost/consul,Spantree/consul,sroegner/consul,shaneog/consul,beni55/consul,macb/consul,dankraw/consul,youhong316/consul,StefanScherer/consul,EasonYi/consul,kingland/consul,zeroae/consul,sfncook/consul,krmcbride/consul,tomdionysus/consul,BWITS/consul,mfischer-zd/consul,mckennajones/consul,kylemcc/consul,kingland/consul,half-dead/consul,msn217/consul,tamsky/consul,linearregression/consul,nvoron23/consul,tugbabodrumlu/consul,calgaryscientific/consul,leowmjw/consul,jeffawang/consul,tshak/consul,zeroae/consul,marclop/consul,kaskavalci/consul,talwai/consul,andygoalkeeper/consul,mshean/consul,BWITS/consul,dustinbrown/consul,DivyaVavili/consul