callback 1 time before looping over the zookeeper's event channel
callback 1 time before looping over the zookeeper's event channel

Signed-off-by: Chanwit Kaewkasi <ee9d6f5c374f9fbae13205760a4ee2f011e8b2ae@gmail.com>

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