Add CHANGELOG-1.18.md for v1.18.0-alpha.1.
Add CHANGELOG-1.18.md for v1.18.0-alpha.1.

pweil-/kubernetes,nikhita/kubernetes,zetaab/kubernetes,sethpollack/kubernetes,weiwei04/kubernetes,liggitt/kubernetes,fejta/kubernetes,jagosan/kubernetes,shyamjvs/kubernetes,sethpollack/kubernetes,erwinvaneyk/kubernetes,huangjiuyuan/kubernetes,davidz627/kubernetes,andrewrynhard/kubernetes,du2016/kubernetes,wongma7/kubernetes,joelsmith/kubernetes,jdef/kubernetes,PI-Victor/kubernetes,LalatenduMohanty/kubernetes,andrewrynhard/kubernetes,k82/kubernetes,tcnghia/kubernetes,xlgao-zju/kubernetes,mikedanese/kubernetes,maciaszczykm/kubernetes,krmayankk/kubernetes,johscheuer/kubernetes,tomzhang/kubernetes,cofyc/kubernetes,sanjeevm0/kubernetes,yarntime/kubernetes,tomerf/kubernetes,jackfrancis/kubernetes,carlory/kubernetes,derekwaynecarr/kubernetes,thockin/kubernetes,fanzhangio/kubernetes,pmorie/kubernetes,tallclair/kubernetes,xlgao-zju/kubernetes,luxas/kubernetes,stevesloka/kubernetes,xlgao-zju/kubernetes,aveshagarwal/kubernetes,PiotrProkop/kubernetes,jfrazelle/kubernetes,ii/kubernetes,ravilr/kubernetes,mosoft521/kubernetes,xlgao-zju/kubernetes,li-ang/kubernetes,deads2k/kubernetes,verult/kubernetes,yarntime/kubernetes,yujuhong/kubernetes,tomzhang/kubernetes,pires/kubernetes,fanzhangio/kubernetes,Clarifai/kubernetes,jagosan/kubernetes,maciaszczykm/kubernetes,maciaszczykm/kubernetes,chestack/kubernetes,fanzhangio/kubernetes,tcnghia/kubernetes,zhouhaibing089/kubernetes,tpepper/kubernetes,cblecker/kubernetes,kpgriffith/kubernetes,erwinvaneyk/kubernetes,k82cn/kubernetes,jsafrane/kubernetes,mboersma/kubernetes,dims/kubernetes,k82/kubernetes,xlgao-zju/kubernetes,aveshagarwal/kubernetes,yujuhong/kubernetes,csrwng/kubernetes,kitt1987/kubernetes,joelsmith/kubernetes,jingxu97/kubernetes,joelsmith/kubernetes,matthyx/kubernetes,fanzhangio/kubernetes,luxas/kubernetes,weiwei04/kubernetes,xychu/kubernetes,mboersma/kubernetes,frodenas/kubernetes,Lion-Wei/kubernetes,mYmNeo/kubernetes,tomzhang/kubernetes,mkumatag/kubernetes,hex108/kubernetes,mikedanese/kubernetes,micahhausler/kubernetes,weiwei04/kubernetes,mosoft521/kubernetes,openshift/kubernetes,GulajavaMinistudio/kubernetes,johscheuer/kubernetes,PiotrProkop/kubernetes,krmayankk/kubernetes,kitt1987/kubernetes,mahak/kubernetes,zetaab/kubernetes,yarntime/kubernetes,cofyc/kubernetes,cofyc/kubernetes,maciaszczykm/kubernetes,tomerf/kubernetes,mboersma/kubernetes,fgimenez/kubernetes,rrati/kubernetes,ingvagabund/kubernetes,tomerf/kubernetes,krmayankk/kubernetes,x13n/kubernetes,mengqiy/kubernetes,shyamjvs/kubernetes,saad-ali/kubernetes,u2takey/kubernetes,saad-ali/kubernetes,du2016/kubernetes,erwinvaneyk/kubernetes,pwittrock/kubernetes,fgimenez/kubernetes,ixdy/kubernetes,jessfraz/kubernetes,pweil-/kubernetes,mengqiy/kubernetes,frodenas/kubernetes,kevensen/kubernetes,LalatenduMohanty/kubernetes,nikhita/kubernetes,fabriziopandini/kubernetes,aveshagarwal/kubernetes,brendandburns/kubernetes,openshift/kubernetes,dereknex/kubernetes,PiotrProkop/kubernetes,saad-ali/kubernetes,rrati/kubernetes,nikhita/kubernetes,andrewsykim/kubernetes,krmayankk/kubernetes,pires/kubernetes,li-ang/kubernetes,maciaszczykm/kubernetes,GulajavaMinistudio/kubernetes,roberthbailey/kubernetes,iameli/kubernetes,ravilr/kubernetes,nak3/kubernetes,wongma7/kubernetes,tallclair/kubernetes,tengqm/kubernetes,frodenas/kubernetes,GulajavaMinistudio/kubernetes,ii/kubernetes,shyamjvs/kubernetes,zhangmingld/kubernetes,aledbf/kubernetes,aledbf/kubernetes,alejandroEsc/kubernetes,mengqiy/kubernetes,chrislovecnm/kubernetes,spzala/kubernetes,linux-on-ibm-z/kubernetes,hex108/kubernetes,klaus1982/kubernetes,fejta/kubernetes,yarntime/kubernetes,MHBauer/kubernetes,lojies/kubernetes,ping035627/kubernetes,iterion/kubernetes,sanjeevm0/kubernetes,chrislovecnm/kubernetes,tpepper/kubernetes,chestack/kubernetes,tpepper/kubernetes,olivierlemasle/kubernetes,xychu/kubernetes,brendandburns/kubernetes,zhangmingld/kubernetes,Acidburn0zzz/kubernetes,brendandburns/kubernetes,pires/kubernetes,rnaveiras/kubernetes,ii/kubernetes,kevensen/kubernetes,sdminonne/kubernetes,verult/kubernetes,iterion/kubernetes,pwittrock/kubernetes,dlorenc/kubernetes,Acidburn0zzz/kubernetes,ravisantoshgudimetla/kubernetes,alejandroEsc/kubernetes,roberthbailey/kubernetes,enj/kubernetes,thockin/kubernetes,linux-on-ibm-z/kubernetes,rrati/kubernetes,kpgriffith/kubernetes,linux-on-ibm-z/kubernetes,iterion/kubernetes,pires/kubernetes,Clarifai/kubernetes,huangjiuyuan/kubernetes,k82cn/kubernetes,jagosan/kubernetes,klaus1982/kubernetes,jdef/kubernetes,matthyx/kubernetes,wanghaoran1988/kubernetes,enj/kubernetes,BenTheElder/kubernetes,ravilr/kubernetes,csrwng/kubernetes,carlory/kubernetes,openshift/kubernetes,davidz627/kubernetes,kubernetes/kubernetes,sanjeevm0/kubernetes,pmorie/kubernetes,pweil-/kubernetes,roberthbailey/kubernetes,micahhausler/kubernetes,hex108/kubernetes,mboersma/kubernetes,nikhita/kubernetes,pmorie/kubernetes,monopole/kubernetes,idvoretskyi/kubernetes,spzala/kubernetes,erwinvaneyk/kubernetes,thockin/kubernetes,iameli/kubernetes,x13n/kubernetes,mYmNeo/kubernetes,jagosan/kubernetes,t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