Update etcd image in integration tests to 2.2.0
Update etcd image in integration tests to 2.2.0

Signed-off-by: Alexandre Beslic <a2bebfa25877ed8f3a644256dc060dfe32006f27@docker.com>

BSWANG/denverdino.github.io,doronp/swarm,denverdino/swarm,cpuguy83/swarm,rillig/docker.github.io,bsmr-docker/swarm,barais/swarm,LuisBosquez/docker.github.io,gdevillele/docker.github.io,dnephin/swarm,gdevillele/docker.github.io,gdevillele/docker.github.io,joeuo/docker.github.io,shubheksha/docker.github.io,joeuo/docker.github.io,denverdino/swarm,JimGalasyn/docker.github.io,LuisBosquez/docker.github.io,menglingwei/denverdino.github.io,BSWANG/swarm,sanscontext/docker.github.io,rchicoli/swarm,denverdino/denverdino.github.io,allencloud/swarm,morpheyesh/swarm,aduermael/docker.github.io,bdwill/docker.github.io,thaJeztah/docker.github.io,riuvshin/swarm,alexisbellido/docker.github.io,Spritekin/swarm,joaofnfernandes/docker.github.io,moxiegirl/swarm,JimGalasyn/docker.github.io,londoncalling/docker.github.io,BSWANG/denverdino.github.io,schmunk42/swarm,aduermael/docker.github.io,joaofnfernandes/docker.github.io,rancher/swarm,BSWANG/denverdino.github.io,MHBauer/swarm,rchicoli/swarm,shin-/docker.github.io,londoncalling/docker.github.io,LuisBosquez/docker.github.io,resouer/swarm,phiroict/docker,JimGalasyn/docker.github.io,denverdino/denverdino.github.io,kyhavlov/swarm,alexisbellido/docker.github.io,LuisBosquez/docker.github.io,mgoelzer/swarm,londoncalling/docker.github.io,joaofnfernandes/docker.github.io,barais/swarm,echupriyanov/swarm,bdwill/docker.github.io,ezrasilvera/swarm,troy0820/docker.github.io,docker/docker.github.io,shubheksha/docker.github.io,danix800/docker.github.io,johnstep/docker.github.io,megamsys/swarm,londoncalling/docker.github.io,docker-zh/docker.github.io,joeuo/docker.github.io,rillig/docker.github.io,rillig/docker.github.io,xFragger/swarm,bdwill/docker.github.io,fugr/swarm,gdevillele/docker.github.io,phiroict/docker,troy0820/docker.github.io,CodeNow/swarm,docker-zh/docker.github.io,echupriyanov/swarm,aduermael/docker.github.io,liubin/swarm,CodeNow/swarm,linecheng/swarm,bdwill/docker.github.io,docker-zh/docker.github.io,mgoelzer/swarm,phiroict/docker,thaJeztah/docker.github.io,allencloud/swarm,danix800/docker.github.io,xFragger/swarm,troy0820/docker.github.io,BSWANG/denverdino.github.io,schmunk42/swarm,rillig/docker.github.io,LukasBacigal/swarm,aduermael/docker.github.io,swarm-hooks/swarm,JimGalasyn/docker.github.io,docker/docker.github.io,MHBauer/swarm,jzwlqx/denverdino.github.io,anweiss/docker.github.io,docker/docker.github.io,phiroict/docker,kunalkushwaha/swarm,danix800/docker.github.io,rancher/swarm,auzias/swarm,johnstep/docker.github.io,anweiss/docker.github.io,sanscontext/docker.github.io,denverdino/denverdino.github.io,pdevine/swarm,cpuguy83/swarm,gdevillele/docker.github.io,JimGalasyn/docker.github.io,auzias/swarm,denverdino/denverdino.github.io,menglingwei/denverdino.github.io,ch3lo/swarm,alexisbellido/docker.github.io,docker/docker.github.io,anweiss/docker.github.io,moxiegirl/swarm,joaofnfernandes/docker.github.io,shubheksha/docker.github.io,gradywang/swarm,sanscontext/docker.github.io,morpheyesh/swarm,denverdino/docker.github.io,CiaranCostello/swarm,shubheksha/docker.github.io,BSWANG/denverdino.github.io,sfsmithcha/swarm,atlassian/swarm,denverdino/docker.github.io,LukasBacigal/swarm,troy0820/docker.github.io,qianzhangxa/swarm,denverdino/docker.github.io,shin-/docker.github.io,thaJeztah/docker.github.io,denverdino/denverdino.github.io,jimmycmh/swarm,kyhavlov/swarm,joaofnfernandes/docker.github.io,docker-zh/docker.github.io,joeuo/docker.github.io,dnephin/swarm,joeuo/docker.github.io,denverdino/docker.github.io,menglingwei/denverdino.github.io,johnstep/docker.github.io,pdevine/swarm,bsmr-docker/swarm,anweiss/docker.github.io,alexisbellido/docker.github.io,atlassian/swarm,jzwlqx/denverdino.github.io,megamsys/swarm,anweiss/docker.github.io,resouer/swarm,thaJeztah/docker.github.io,LuisBosquez/docker.github.io,phiroict/docker,swarm-hooks/swarm,kunalkushwaha/swarm,johnstep/docker.github.io,ezrasilvera/swarm,shubheksha/docker.github.io,BSWANG/swarm,menglingwei/denverdino.github.io,liubin/swarm,Spritekin/swarm,fugr/swarm,shin-/docker.github.io,shin-/docker.github.io,menglingwei/denverdino.github.io,johnstep/docker.github.io,doronp/swarm,CiaranCostello/swarm,jzwlqx/denverdino.github.io,qianzhangxa/swarm,riuvshin/swarm,gradywang/swarm,jzwlqx/denverdino.github.io,sanscontext/docker.github.io,ch3lo/swarm,denverdino/docker.github.io,linecheng/swarm,alexisbellido/docker.github.io,jimmycmh/swarm,docker/docker.github.io,sanscontext/docker.github.io,jzwlqx/denverdino.github.io,danix800/docker.github.io,docker-zh/docker.github.io,thaJeztah/docker.github.io,sfsmithcha/swarm,bdwill/docker.github.io,londoncalling/docker.github.io,shin-/docker.github.io