test/e2e/apimachinery: add e2e test for APIServerIdentity, validating behavior when restarting kube-apiserver
test/e2e/apimachinery: add e2e test for APIServerIdentity, validating behavior when restarting kube-apiserver

Signed-off-by: Andrew Sy Kim <e6955f0a2995ee00d92594510dd67341c68bf52d@google.com>

warmchang/kubernetes,GulajavaMinistudio/kubernetes,soltysh/kubernetes,olivierlemasle/kubernetes,olivierlemasle/kubernetes,ping035627/kubernetes,dims/kubernetes,jessfraz/kubernetes,kevin-wangzefeng/kubernetes,mosoft521/kubernetes,warmchang/kubernetes,PiotrProkop/kubernetes,GulajavaMinistudio/kubernetes,mahak/kubernetes,ping035627/kubernetes,jackfrancis/kubernetes,kubernetes/kubernetes,kubernetes/kubernetes,mahak/kubernetes,soltysh/kubernetes,soltysh/kubernetes,liggitt/kubernetes,enj/kubernetes,matthyx/kubernetes,liggitt/kubernetes,jessfraz/kubernetes,lojies/kubernetes,enj/kubernetes,ping035627/kubernetes,gnufied/kubernetes,liggitt/kubernetes,jackfrancis/kubernetes,jessfraz/kubernetes,matthyx/kubernetes,deads2k/kubernetes,jackfrancis/kubernetes,kubernetes/kubernetes,soltysh/kubernetes,k82cn/kubernetes,deads2k/kubernetes,mosoft521/kubernetes,olivierlemasle/kubernetes,jackfrancis/kubernetes,MikeSpreitzer/kubernetes,PiotrProkop/kubernetes,MikeSpreitzer/kubernetes,dims/kubernetes,deads2k/kubernetes,mosoft521/kubernetes,GulajavaMinistudio/kubernetes,lojies/kubernetes,matthyx/kubernetes,jackfrancis/kubernetes,soltysh/kubernetes,enj/kubernetes,matthyx/kubernetes,kubernetes/kubernetes,ping035627/kubernetes,PiotrProkop/kubernetes,warmchang/kubernetes,kevin-wangzefeng/kubernetes,mosoft521/kubernetes,kevin-wangzefeng/kubernetes,mahak/kubernetes,PiotrProkop/kubernetes,MikeSpreitzer/kubernetes,gnufied/kubernetes,gnufied/kubernetes,warmchang/kubernetes,MikeSpreitzer/kubernetes,k82cn/kubernetes,olivierlemasle/kubernetes,lojies/kubernetes,MikeSpreitzer/kubernetes,liggitt/kubernetes,dims/kubernetes,GulajavaMinistudio/kubernetes,kevin-wangzefeng/kubernetes,olivierlemasle/kubernetes,matthyx/kubernetes,lojies/kubernetes,PiotrProkop/kubernetes,mosoft521/kubernetes,liggitt/kubernetes,GulajavaMinistudio/kubernetes,enj/kubernetes,dims/kubernetes,gnufied/kubernetes,k82cn/kubernetes,warmchang/kubernetes,jessfraz/kubernetes,k82cn/kubernetes,enj/kubernetes,ping035627/kubernetes,deads2k/kubernetes,kevin-wangzefeng/kubernetes,gnufied/kubernetes,mahak/kubernetes,lojies/kubernetes,deads2k/kubernetes,jessfraz/kubernetes,mahak/kubernetes,kubernetes/kubernetes,k82cn/kubernetes,dims/kubernetes