kubeadm: using the existing exported method to add config flag
kubeadm: using the existing exported method to add config flag

Signed-off-by: Dave Chen <3fbbe9d8910afe5176d6dd2fc1de9e5729a30247@arm.com>

jackfrancis/kubernetes,gnufied/kubernetes,kevin-wangzefeng/kubernetes,jessfraz/kubernetes,mengqiy/kubernetes,ravilr/kubernetes,mkumatag/kubernetes,kubernetes/kubernetes,lojies/kubernetes,ravilr/kubernetes,lojies/kubernetes,kubernetes/kubernetes,shyamjvs/kubernetes,BenTheElder/kubernetes,deads2k/kubernetes,mahak/kubernetes,dims/kubernetes,k82cn/kubernetes,mkumatag/kubernetes,k82cn/kubernetes,dims/kubernetes,matthyx/kubernetes,PiotrProkop/kubernetes,ravilr/kubernetes,chestack/kubernetes,enj/kubernetes,liggitt/kubernetes,deads2k/kubernetes,ping035627/kubernetes,warmchang/kubernetes,mahak/kubernetes,ravilr/kubernetes,iameli/kubernetes,olivierlemasle/kubernetes,ravilr/kubernetes,kubernetes/kubernetes,dims/kubernetes,mosoft521/kubernetes,GulajavaMinistudio/kubernetes,olivierlemasle/kubernetes,carlory/kubernetes,kevin-wangzefeng/kubernetes,warmchang/kubernetes,PiotrProkop/kubernetes,BenTheElder/kubernetes,PiotrProkop/kubernetes,enj/kubernetes,carlory/kubernetes,dims/kubernetes,mosoft521/kubernetes,iameli/kubernetes,zhangmingld/kubernetes,GulajavaMinistudio/kubernetes,GulajavaMinistudio/kubernetes,ping035627/kubernetes,cblecker/kubernetes,zhangmingld/kubernetes,mosoft521/kubernetes,soltysh/kubernetes,iameli/kubernetes,zhangmingld/kubernetes,iameli/kubernetes,mosoft521/kubernetes,lojies/kubernetes,matthyx/kubernetes,GulajavaMinistudio/kubernetes,deads2k/kubernetes,mkumatag/kubernetes,jessfraz/kubernetes,jsafrane/kubernetes,dims/kubernetes,ping035627/kubernetes,cblecker/kubernetes,soltysh/kubernetes,matthyx/kubernetes,matthyx/kubernetes,zhangmingld/kubernetes,ping035627/kubernetes,deads2k/kubernetes,warmchang/kubernetes,deads2k/kubernetes,mosoft521/kubernetes,gnufied/kubernetes,jessfraz/kubernetes,MikeSpreitzer/kubernetes,gnufied/kubernetes,liggitt/kubernetes,mahak/kubernetes,matthyx/kubernetes,jsafrane/kubernetes,shyamjvs/kubernetes,kevin-wangzefeng/kubernetes,liggitt/kubernetes,cblecker/kubernetes,BenTheElder/kubernetes,mengqiy/kubernetes,gnufied/kubernetes,warmchang/kubernetes,jackfrancis/kubernetes,chestack/kubernetes,jackfrancis/kubernetes,chestack/kubernetes,BenTheElder/kubernetes,MikeSpreitzer/kubernetes,soltysh/kubernetes,zhangmingld/kubernetes,mkumatag/kubernetes,thockin/kubernetes,enj/kubernetes,kevin-wangzefeng/kubernetes,enj/kubernetes,k82cn/kubernetes,mahak/kubernetes,jackfrancis/kubernetes,PiotrProkop/kubernetes,jsafrane/kubernetes,PiotrProkop/kubernetes,jessfraz/kubernetes,ping035627/kubernetes,kubernetes/kubernetes,kevin-wangzefeng/kubernetes,soltysh/kubernetes,shyamjvs/kubernetes,MikeSpreitzer/kubernetes,warmchang/kubernetes,GulajavaMinistudio/kubernetes,thockin/kubernetes,mkumatag/kubernetes,cblecker/kubernetes,thockin/kubernetes,MikeSpreitzer/kubernetes,mengqiy/kubernetes,mahak/kubernetes,chestack/kubernetes,soltysh/kubernetes,zhangmingld/kubernetes,mengqiy/kubernetes,jsafrane/kubernetes,BenTheElder/kubernetes,gnufied/kubernetes,jackfrancis/kubernetes,thockin/kubernetes,shyamjvs/kubernetes,MikeSpreitzer/kubernetes,carlory/kubernetes,chestack/kubernetes,thockin/kubernetes,enj/kubernetes,kubernetes/kubernetes,k82cn/kubernetes,k82cn/kubernetes,liggitt/kubernetes,olivierlemasle/kubernetes,lojies/kubernetes,carlory/kubernetes,shyamjvs/kubernetes,olivierlemasle/kubernetes,lojies/kubernetes,liggitt/kubernetes,iameli/kubernetes,olivierlemasle/kubernetes,mengqiy/kubernetes,cblecker/kubernetes,jessfraz/kubernetes,jsafrane/kubernetes,carlory/kubernetes