[Random] Pick a node for O(1), not for O(n)
[Random] Pick a node for O(1), not for O(n)

Signed-off-by: Anton Tiurin <b91bf98aa7cea39040737992640d61c368ae17fe@yandex.ru>

joeuo/docker.github.io,tranceitionalMynd/swarm,barais/swarm,alexisbellido/docker.github.io,qianzhangxa/swarm,shin-/docker.github.io,denverdino/docker.github.io,londoncalling/docker.github.io,troy0820/docker.github.io,allencloud/swarm,kunalkushwaha/swarm,menglingwei/denverdino.github.io,krystism/swarm,moxiegirl/swarm,swarm-hooks/swarm,EderRoger/swarm,shot/swarm,ezrasilvera/SwarmACLs,LuisBosquez/docker.github.io,denverdino/denverdino.github.io,rillig/docker.github.io,bdwill/docker.github.io,rajdeepd/swarm,swarm-hooks/swarm,mrjana/swarm,shot/swarm,schmunk42/swarm,errordeveloper/swarm,jimmycmh/swarm,bdwill/docker.github.io,iaintshine/swarm,gonkulator/swarm,joeuo/docker.github.io,jeffjen/swarm,jzwlqx/denverdino.github.io,jzwlqx/denverdino.github.io,morpheyesh/swarm,rillig/docker.github.io,kunalkushwaha/swarm,EderRoger/swarm,anweiss/docker.github.io,LukasBacigal/swarm,mrjana/swarm,phiroict/docker,menglingwei/denverdino.github.io,docker/docker.github.io,jdamick/swarm,phiroict/docker,rchicoli/swarm,barais/swarm,adouang/swarm,vlajos/swarm,abronan/swarm,Aorjoa/swarm,auzias/swarm,gonkulator/swarm,linecheng/swarm,londoncalling/docker.github.io,therealbill/swarm,docker-zh/docker.github.io,ealang/swarm,joaofnfernandes/docker.github.io,raoofm/swarm,johnstep/docker.github.io,atlassian/swarm,joaofnfernandes/docker.github.io,rav121/swarm,ezrasilvera/swarm,LuisBosquez/docker.github.io,troy0820/docker.github.io,phiroict/docker,LuisBosquez/docker.github.io,LukasBacigal/swarm,jay-lau/swarm,shin-/docker.github.io,resouer/swarm,BSWANG/denverdino.github.io,joaofnfernandes/docker.github.io,mavenugo/swarm,shahankhatch/swarm,rajdeepd/swarm,srikalyan/swarm,ch3lo/swarm,sanscontext/docker.github.io,FollowMyDev/swarm,docker-zh/docker.github.io,thaJeztah/docker.github.io,anweiss/docker.github.io,dnephin/swarm,liubin/swarm,deis/swarm,anweiss/docker.github.io,PeoplePerHour/libswarm,JimGalasyn/docker.github.io,CiaranCostello/swarm,bpradipt/swarm,rchicoli/swarm,gradywang/swarm,schmunk42/swarm,shubheksha/docker.github.io,dims/swarm,gdevillele/docker.github.io,shubheksha/docker.github.io,pdevine/swarm,doronp/swarm,sanscontext/docker.github.io,dnephin/swarm,u2mejc/swarm,danix800/docker.github.io,NunoEdgarGub1/swarm,alexisbellido/docker.github.io,thaJeztah/docker.github.io,BSWANG/swarm,ejholmes/swarm,jzwlqx/denverdino.github.io,denverdino/denverdino.github.io,kyhavlov/swarm,srikalyan/swarm,snrism/swarm,moxiegirl/swarm,danix800/docker.github.io,cgvarela/swarm,pdevine/swarm,shin-/docker.github.io,CiaranCostello/swarm,therealbill/swarm,bsmr-docker/swarm,echupriyanov/swarm,jimmyxian/swarm,JimGalasyn/docker.github.io,unodba/swarm,parapsyche/swarm,BSWANG/denverdino.github.io,FollowMyDev/swarm,tranceitionalMynd/swarm,denverdino/docker.github.io,aduermael/docker.github.io,cgvarela/swarm,cpuguy83/swarm,denverdino/swarm,gdevillele/docker.github.io,u2mejc/swarm,ch3lo/swarm,beni55/swarm-1,menglingwei/denverdino.github.io,everett-toews/swarm,londoncalling/docker.github.io,BSWANG/denverdino.github.io,tangkun75/swarm,jzwlqx/denverdino.github.io,aduermael/docker.github.io,zkcrescent/swarm,shubheksha/docker.github.io,beni55/swarm-1,phiroict/docker,affo/swarm,phiroict/docker,cpuguy83/swarm,rutulpatel/swarm,rutulpatel/swarm,polyverse-security/swarm,akerbis/armhf-swarm,JimGalasyn/docker.github.io,shin-/docker.github.io,denverdino/docker.github.io,denverdino/denverdino.github.io,jimmycmh/swarm,ricca742/swarm,jimenez/swarm,denverdino/swarm,johnstep/docker.github.io,jzwlqx/denverdino.github.io,polyverse-security/swarm,joaofnfernandes/docker.github.io,alexisbellido/docker.github.io,gdevillele/docker.github.io,parapsyche/swarm,gdevillele/docker.github.io,denverdino/denverdino.github.io,joeuo/docker.github.io,londoncalling/docker.github.io,shin-/docker.github.io,ehazlett/swarm,dims/swarm,christophelec/swarm,bdwill/docker.github.io,denverdino/swarm-1,PeoplePerHour/libswarm,aduermael/docker.github.io,sfsmithcha/swarm,FreedomWangLi/swarm,liubin/swarm,danix800/docker.github.io,Aorjoa/swarm,ehazlett/swarm,thaJeztah/docker.github.io,BSWANG/swarm,thaJeztah/docker.github.io,danix800/docker.github.io,BSWANG/denverdino.github.io,echupriyanov/swarm,docker-zh/docker.github.io,fugr/swarm,gradywang/swarm,megamsys/swarm,ejholmes/swarm,francisbouvier/swarm,sanscontext/docker.github.io,xFragger/swarm,docker/docker.github.io,JimGalasyn/docker.github.io,denverdino/docker.github.io,sanscontext/docker.github.io,qianzhangxa/swarm,raoofm/swarm,FreedomWangLi/swarm,deis/swarm,atlassian/swarm,CodeNow/swarm,denverdino/swarm-1,menglingwei/denverdino.github.io,ezrasilvera/swarm,iaintshine/swarm,sfsmithcha/swarm,allencloud/swarm,alexisbellido/docker.github.io,bpradipt/swarm,ricca742/swarm,LuisBosquez/docker.github.io,docker/docker.github.io,shubheksha/docker.github.io,Spritekin/swarm,docker/docker.github.io,krystism/swarm,francisbouvier/swarm,auzias/swarm,riuvshin/swarm,BSWANG/denverdino.github.io,zkcrescent/swarm,ezrasilvera/SwarmACLs,bdwill/docker.github.io,tangkun75/swarm,johnstep/docker.github.io,rancher/swarm,bsmr-docker/swarm,JimGalasyn/docker.github.io,johnstep/docker.github.io,doronp/swarm,rillig/docker.github.io,megamsys/swarm,snrism/swarm,jeffjen/swarm,pssahi/swarm,MHBauer/swarm,mgoelzer/swarm,menglingwei/denverdino.github.io,alexisbellido/docker.github.io,linecheng/swarm,mavenugo/swarm,affo/swarm,LuisBosquez/docker.github.io,akerbis/armhf-swarm,ealang/swarm,mgoelzer/swarm,yp-engineering/swarm,abronan/swarm,aduermael/docker.github.io,jimenez/swarm,thaJeztah/docker.github.io,bdwill/docker.github.io,docker/docker.github.io,joeuo/docker.github.io,johnstep/docker.github.io,joaofnfernandes/docker.github.io,NunoEdgarGub1/swarm,riuvshin/swarm,resouer/swarm,gdevillele/docker.github.io,denverdino/docker.github.io,unodba/swarm,rancher/swarm,troy0820/docker.github.io,sanscontext/docker.github.io,docker-zh/docker.github.io,anweiss/docker.github.io,londoncalling/docker.github.io,rav121/swarm,vlajos/swarm,shubheksha/docker.github.io,xFragger/swarm,docker-zh/docker.github.io,fugr/swarm,everett-toews/swarm,denverdino/denverdino.github.io,jdamick/swarm,morpheyesh/swarm,pssahi/swarm,yp-engineering/swarm,Spritekin/swarm,errordeveloper/swarm,joeuo/docker.github.io,troy0820/docker.github.io,jimmyxian/swarm,adouang/swarm,rillig/docker.github.io,christophelec/swarm,anweiss/docker.github.io,MHBauer/swarm,jay-lau/swarm,kyhavlov/swarm,CodeNow/swarm,shahankhatch/swarm