pkg/proxy/ipvs: add unit tests Test_EndpointSliceOnlyReadyAndTerminatingCluster and Test_EndpointSliceReadyAndTerminatingCluster for validating ProxyTerminatingEndpoints when the traffic policy is 'Cluster'
pkg/proxy/ipvs: add unit tests Test_EndpointSliceOnlyReadyAndTerminatingCluster and Test_EndpointSliceReadyAndTerminatingCluster for validating ProxyTerminatingEndpoints when the traffic policy is 'Cluster'

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

kevin-wangzefeng/kubernetes,zhangmingld/kubernetes,matthyx/kubernetes,chestack/kubernetes,MikeSpreitzer/kubernetes,bparees/kubernetes,lojies/kubernetes,GulajavaMinistudio/kubernetes,PiotrProkop/kubernetes,mikebrow/kubernetes,lojies/kubernetes,jackfrancis/kubernetes,carlory/kubernetes,carlory/kubernetes,soltysh/kubernetes,mkumatag/kubernetes,mahak/kubernetes,rrati/kubernetes,zhouhaibing089/kubernetes,BenTheElder/kubernetes,kubernetes/kubernetes,kubernetes/kubernetes,matthyx/kubernetes,fabriziopandini/kubernetes,PiotrProkop/kubernetes,chestack/kubernetes,fabriziopandini/kubernetes,jsafrane/kubernetes,csrwng/kubernetes,alejandroEsc/kubernetes,nikhita/kubernetes,liggitt/kubernetes,jackfrancis/kubernetes,GulajavaMinistudio/kubernetes,bparees/kubernetes,openshift/kubernetes,tengqm/kubernetes,k82cn/kubernetes,openshift/kubernetes,BenTheElder/kubernetes,linux-on-ibm-z/kubernetes,olivierlemasle/kubernetes,mengqiy/kubernetes,mikebrow/kubernetes,enj/kubernetes,matthyx/kubernetes,k82cn/kubernetes,jessfraz/kubernetes,jsafrane/kubernetes,mkumatag/kubernetes,PiotrProkop/kubernetes,enj/kubernetes,warmchang/kubernetes,rnaveiras/kubernetes,jingxu97/kubernetes,aledbf/kubernetes,linux-on-ibm-z/kubernetes,enj/kubernetes,ii/kubernetes,iameli/kubernetes,deads2k/kubernetes,kevin-wangzefeng/kubernetes,mosoft521/kubernetes,olivierlemasle/kubernetes,ping035627/kubernetes,zhouhaibing089/kubernetes,olivierlemasle/kubernetes,mosoft521/kubernetes,li-ang/kubernetes,feiskyer/kubernetes,verb/kubernetes,jessfraz/kubernetes,jingxu97/kubernetes,dixudx/kubernetes,dixudx/kubernetes,jackfrancis/kubernetes,jessfraz/kubernetes,nikhita/kubernetes,bparees/kubernetes,dixudx/kubernetes,PiotrProkop/kubernetes,enj/kubernetes,feiskyer/kubernetes,verb/kubernetes,alejandroEsc/kubernetes,mkumatag/kubernetes,dixudx/kubernetes,li-ang/kubernetes,bparees/kubernetes,warmchang/kubernetes,mengqiy/kubernetes,shyamjvs/kubernetes,matthyx/kubernetes,jessfraz/kubernetes,gnufied/kubernetes,mengqiy/kubernetes,mengqiy/kubernetes,jingxu97/kubernetes,openshift/kubernetes,alejandroEsc/kubernetes,chestack/kubernetes,zhangmingld/kubernetes,verb/kubernetes,mikebrow/kubernetes,jsafrane/kubernetes,gnufied/kubernetes,bparees/kubernetes,BenTheElder/kubernetes,zhouhaibing089/kubernetes,rnaveiras/kubernetes,dixudx/kubernetes,liggitt/kubernetes,mosoft521/kubernetes,mahak/kubernetes,mkumatag/kubernetes,cblecker/kubernetes,cblecker/kubernetes,ravilr/kubernetes,openshift/kubernetes,deads2k/kubernetes,GulajavaMinistudio/kubernetes,gnufied/kubernetes,ping035627/kubernetes,lojies/kubernetes,iameli/kubernetes,carlory/kubernetes,ii/kubernetes,tengqm/kubernetes,fabriziopandini/kubernetes,verb/kubernetes,openshift/kubernetes,gnufied/kubernetes,jackfrancis/kubernetes,fabriziopandini/kubernetes,k82cn/kubernetes,dims/kubernetes,tengqm/kubernetes,tengqm/kubernetes,chestack/kubernetes,enj/kubernetes,tengqm/kubernetes,rrati/kubernetes,linux-on-ibm-z/kubernetes,jsafrane/kubernetes,shyamjvs/kubernetes,MikeSpreitzer/kubernetes,mahak/kubernetes,liggitt/kubernetes,carlory/kubernetes,ravilr/kubernetes,deads2k/kubernetes,kevin-wangzefeng/kubernetes,mosoft521/kubernetes,jsafrane/kubernetes,shyamjvs/kubernetes,GulajavaMinistudio/kubernetes,k82cn/kubernetes,ravilr/kubernetes,thockin/kubernetes,mengqiy/kubernetes,csrwng/kubernetes,feiskyer/kubernetes,warmchang/kubernetes,dims/kubernetes,feiskyer/kubernetes,lojies/kubernetes,aledbf/kubernetes,shyamjvs/kubernetes,ping035627/kubernetes,alejandroEsc/kubernetes,cblecker/kubernetes,rnaveiras/kubernetes,GulajavaMinistudio/kubernetes,rrati/kubernetes,csrwng/kubernetes,linux-on-ibm-z/kubernetes,shyamjvs/kubernetes,thockin/kubernetes,nikhita/kubernetes,thockin/kubernetes,linux-on-ibm-z/kubernetes,fabriziopandini/kubernetes,mahak/kubernetes,aledbf/kubernetes,jackfrancis/kubernetes,zhangmingld/kubernetes,rnaveiras/kubernetes,zhangmingld/kubernetes,jessfraz/kubernetes,dims/kubernetes,ping035627/kubernetes,iameli/kubernetes,BenTheElder/kubernetes,olivierlemasle/kubernetes,kubernetes/kubernetes,aledbf/kubernetes,ii/kubernetes,soltysh/kubernetes,mkumatag/kubernetes,deads2k/kubernetes,li-ang/kubernetes,MikeSpreitzer/kubernetes,mikebrow/kubernetes,olivierlemasle/kubernetes,rrati/kubernetes,thockin/kubernetes,ping035627/kubernetes,thockin/kubernetes,ravilr/kubernetes,deads2k/kubernetes,nikhita/kubernetes,cblecker/kubernetes,lojies/kubernetes,soltysh/kubernetes,zhouhaibing089/kubernetes,soltysh/kubernetes,aledbf/kubernetes,csrwng/kubernetes,kubernetes/kubernetes,warmchang/kubernetes,soltysh/kubernetes,alejandroEsc/kubernetes,jingxu97/kubernetes,rnaveiras/kubernetes,iameli/kubernetes,ii/kubernetes,ravilr/kubernetes,iameli/kubernetes,ii/kubernetes,warmchang/kubernetes,nikhita/kubernetes,kevin-wangzefeng/kubernetes,kevin-wangzefeng/kubernetes,mahak/kubernetes,li-ang/kubernetes,k82cn/kubernetes,csrwng/kubernetes,PiotrProkop/kubernetes,li-ang/kubernetes,feiskyer/kubernetes,zhangmingld/kubernetes,zhangmingld/kubernetes,MikeSpreitzer/kubernetes,zhouhaibing089/kubernetes,verb/kubernetes,mo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