test/e2e/node: fix selinux test failure
test/e2e/node: fix selinux test failure

Commit 69a473be3 broke the test case (that was checking
that a file from a volume can't be read) by adding a
(wrong) assumption that error should be nil.

Fix the assumption (we do expect the error here).
Note that we were checking file contents before; now when
we check the error from read, checking the contents is
redundant.

The other issue with the test is SELinux should be in enforcing
mode for this to work, so let's check that first to avoid
false positives.

Signed-off-by: Kir Kolyshkin <3a017b8ddb3f9cf3e4a59978b004111bdeb97f08@gmail.com>

roberthbailey/kubernetes,fanzhangio/kubernetes,ii/kubernetes,yarntime/kubernetes,jagosan/kubernetes,PiotrProkop/kubernetes,fabriziopandini/kubernetes,yujuhong/kubernetes,pmorie/kubernetes,MHBauer/kubernetes,sethpollack/kubernetes,olivierlemasle/kubernetes,openshift/kubernetes,chestack/kubernetes,ravisantoshgudimetla/kubernetes,fgimenez/kubernetes,iterion/kubernetes,rrati/kubernetes,mahak/kubernetes,zhangmingld/kubernetes,tomzhang/kubernetes,mengqiy/kubernetes,gnufied/kubernetes,lojies/kubernetes,krmayankk/kubernetes,andrewsykim/kubernetes,rafax/kubernetes,PiotrProkop/kubernetes,andrewrynhard/kubernetes,mboersma/kubernetes,enj/kubernetes,monopole/kubernetes,jdef/kubernetes,klaus1982/kubernetes,openshift/kubernetes,johscheuer/kubernetes,stevesloka/kubernetes,idvoretskyi/kubernetes,verult/kubernetes,matthyx/kubernetes,johscheuer/kubernetes,olivierlemasle/kubernetes,mboersma/kubernetes,jessfraz/kubernetes,ii/kubernetes,kevensen/kubernetes,mkumatag/kubernetes,Acidburn0zzz/kubernetes,mengqiy/kubernetes,pires/kubernetes,li-ang/kubernetes,verb/kubernetes,liggitt/kubernetes,ingvagabund/kubernetes,warmchang/kubernetes,kitt1987/kubernetes,mYmNeo/kubernetes,kpgriffith/kubernetes,maciaszczykm/kubernetes,chrislovecnm/kubernetes,cmluciano/kubernetes,PiotrProkop/kubernetes,tomerf/kubernetes,ping035627/kubernetes,kevin-wangzefeng/kubernetes,fabriziopandini/kubernetes,zhangmingld/kubernetes,zhangmingld/kubernetes,ping035627/kubernetes,yarntime/kubernetes,csrwng/kubernetes,MHBauer/kubernetes,k82/kubernetes,fejta/kubernetes,iameli/kubernetes,jingxu97/kubernetes,mahak/kubernetes,tpepper/kubernetes,tcnghia/kubernetes,nikhita/kubernetes,krmayankk/kubernetes,PiotrProkop/kubernetes,LalatenduMohanty/kubernetes,andrewsykim/kubernetes,coolsvap/kubernetes,wanghaoran1988/kubernetes,verult/kubernetes,yarntime/kubernetes,nak3/kubernetes,iterion/kubernetes,enj/kubernetes,monopole/kubernetes,bparees/kubernetes,saad-ali/kubernetes,stevesloka/kubernetes,zetaab/kubernetes,deads2k/kubernetes,jagosan/kubernetes,jagosan/kubernetes,weiwei04/kubernetes,davidz627/kubernetes,k82/kubernetes,huangjiuyuan/kubernetes,carlory/kubernetes,li-ang/kubernetes,idvoretskyi/kubernetes,pmorie/kubernetes,sanjeevm0/kubernetes,maciaszczykm/kubernetes,aledbf/kubernetes,carlory/kubernetes,zhouhaibing089/kubernetes,johscheuer/kubernetes,linux-on-ibm-z/kubernetes,ingvagabund/kubernetes,x13n/kubernetes,enj/kubernetes,mikedanese/kubernetes,coolsvap/kubernetes,jsafrane/kubernetes,dereknex/kubernetes,kevin-wangzefeng/kubernetes,cmluciano/kubernetes,jdef/kubernetes,dlorenc/kubernetes,tallclair/kubernetes,pmorie/kubernetes,idvoretskyi/kubernetes,fgimenez/kubernetes,xlgao-zju/kubernetes,tpepper/kubernetes,idvoretskyi/kubernetes,mosoft521/kubernetes,JacobTanenbaum/kubernetes,cmluciano/kubernetes,lojies/kubernetes,aledbf/kubernetes,andrewrynhard/kubernetes,iterion/kubernetes,dereknex/kubernetes,andrewsykim/kubernetes,x13n/kubernetes,Lion-Wei/kubernetes,tpepper/kubernetes,joelsmith/kubernetes,tomzhang/kubernetes,brendandburns/kubernetes,verult/kubernetes,lojies/kubernetes,chestack/kubernetes,humblec/kubernetes,olivierlemasle/kubernetes,fejta/kubernetes,BenTheElder/kubernetes,JacobTanenbaum/kubernetes,csrwng/kubernetes,MikeSpreitzer/kubernetes,ravilr/kubernetes,andrewrynhard/kubernetes,rnaveiras/kubernetes,kpgriffith/kubernetes,krmayankk/kubernetes,du2016/kubernetes,jsafrane/kubernetes,mboersma/kubernetes,li-ang/kubernetes,rrati/kubernetes,mboersma/kubernetes,zhouhaibing089/kubernetes,yarntime/kubernetes,tallclair/kubernetes,Clarifai/kubernetes,wanghaoran1988/kubernetes,mahak/kubernetes,tallclair/kubernetes,kevensen/kubernetes,Acidburn0zzz/kubernetes,zhangmingld/kubernetes,carlory/kubernetes,warmchang/kubernetes,rafax/kubernetes,idvoretskyi/kubernetes,feiskyer/kubernetes,Acidburn0zzz/kubernetes,matthyx/kubernetes,cofyc/kubernetes,ping035627/kubernetes,mYmNeo/kubernetes,mosoft521/kubernetes,ravilr/kubernetes,weiwei04/kubernetes,wanghaoran1988/kubernetes,jsafrane/kubernetes,BenTheElder/kubernetes,hex108/kubernetes,csrwng/kubernetes,nckturner/kubernetes,thockin/kubernetes,lojies/kubernetes,saad-ali/kubernetes,LalatenduMohanty/kubernetes,warmchang/kubernetes,stevesloka/kubernetes,mfojtik/kubernetes,BenTheElder/kubernetes,BenTheElder/kubernetes,rnaveiras/kubernetes,jackfrancis/kubernetes,andrewrynhard/kubernetes,Lion-Wei/kubernetes,sdminonne/kubernetes,feiskyer/kubernetes,pires/kubernetes,tallclair/kubernetes,coolsvap/kubernetes,PI-Victor/kubernetes,roberthbailey/kubernetes,kpgriffith/kubernetes,rrati/kubernetes,andrewrynhard/kubernetes,kevensen/kubernetes,nckturner/kubernetes,pmorie/kubernetes,shyamjvs/kubernetes,kitt1987/kubernetes,aveshagarwal/kubernetes,wanghaoran1988/kubernetes,yujuhong/kubernetes,jdef/kubernetes,Acidburn0zzz/kubernetes,joelsmith/kubernetes,mikedanese/kubernetes,nak3/kubernetes,linux-on-ibm-z/kubernetes,verb/kubernetes,fgimenez/kubernetes,jdef/kubernetes,ravisantoshgudimetla/kubernetes,krmayankk/kubernetes,maciaszczykm/kubernetes,mboersma/kubernetes,kubernetes/kube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