nsenter: add tests
nsenter: add tests

Signed-off-by: Andrey Vagin <74c05afa918858348d6db8037d82fa8124870113@openvz.org>

kolyshkin/runc,kimh/runc,fabiokung/runc,navidshaikh/runc,HardikDR/runc,rhatdan/runc,subuser-security/runc,mrunalp/runc,ycaihua/runc,ZJU-SEL/runc,dieface/runc,clnperez/runc,LTD-Beget/libcontainer,justincormack/runc,meihuabo/runc,sallyom/runc,zhangyancoder/libcontainer,markllama/runc,hqhq/libcontainer,mYmNeo/runc,cxxly/runc,jhowardmsft/runc,jwuwork/runc,HuKeping/runc,rootfs/runc,han-wang/runc,estesp/libcontainer,aidanhs/runc,cyphar/runc,rhatdan/runc,docker/runc,subuser-security/runc,ycaihua/runc,markllama/runc,justincormack/runc,calavera/runc,mheon/runc,hqhq/libcontainer,shenxiaochen/libcontainer,mheon/libcontainer,runcom/libcontainer,mYmNeo/runc,sallyom/runc,haijunTan/runc,icecrime/libcontainer,SaiedKazemi/libcontainer-criu,fabiokung/runc,ChengTiesheng/runc,w4ngyi/libcontainer,LTD-Beget/libcontainer,abduld/runc,opencontainers/runc,rhatdan/runc,YujiOshima/runc,whosthatknocking/runc,stefanberger/runc,mapk0y/runc,keloyang/runc,fabiokung/runc,marcosnils/runc,booyaa/runc,mheon/runc,zhangyancoder/libcontainer,zenlinTechnofreak/runc,rhatdan/libcontainer,justincormack/runc,ycaihua/libcontainer,jhjeong-kr/runc,mrunalp/runc,hqhq/runc,abduld/runc,rhatdan/libcontainer,vbatts/runc,vbatts/runc,tangkun75/libcontainer,cloudfoundry-incubator/runc,keloyang/libcontainer,ChengTiesheng/runc,opencontainers/runc,rhatdan/libcontainer,mikebrow/runc,ZJU-SEL/libcontainer,hqhq/libcontainer,mYmNeo/runc,carlye566/runc,gitido/runc,hqhq/runc,whosthatknocking/runc,jwuwork/runc,SaiedKazemi/libcontainer-criu,rhatdan/runc,zhangyancoder/libcontainer,hxfeng/runc,LK4D4/runc,avagin/runc,talwai/runc,wcwxyz/runc,jhowardmsft/runc,carlye566/runc,willmtemple/runc,subuser-security/runc,sallyom/runc,willmtemple/runc,clnperez/runc,jhjeong-kr/runc,mheon/runc,ddnbgroup/runc,keloyang/runc,runcom/runc,avagin/runc,vbatts/runc,keloyang/libcontainer,keloyang/libcontainer,wangkirin/runc,shenxiaochen/libcontainer,rootfs/runc,dqminh/libcontainer,shishir-a412ed/runc,cloudfoundry-incubator/runc,ZJU-SEL/libcontainer,lizf-os/runc,rajasec/runc,meihuabo/runc,chenchun/runc,HuKeping/runc,mheon/libcontainer,ycaihua/runc,wcwxyz/runc,InformatiQ/runc,lizf-os/runc,inatatsu/runc,mrunalp/libcontainer,willmtemple/runc,boucher/libcontainer,kolyshkin/runc,thaJeztah/libcontainer,icecrime/libcontainer,tangkun75/libcontainer,crosbymichael/runc,abduld/runc,w4ngyi/libcontainer,axsh/runc,nkwilson/runc,liuwharton/runc,kolyshkin/runc,xiaochenshen/runc,wking/runc,clnperez/runc,estesp/runc,thaJeztah/libcontainer,kolyshkin/runc,icecrime/libcontainer,dieface/runc,dqminh/runc,adrianreber/runc,crosbymichael/libcontainer,cyphar/runc,marcosnils/runc,docker/runc,albertoleal/runc,gwoo/runc,runcom/libcontainer,WeiZhang555/runc,rajasec/runc,maxamillion/runc,Microsoft/libcontainer,crosbymichael/runc,WeiZhang555/runc,mapk0y/runc,chenchun/runc,ekuric/runc,tangkun75/libcontainer,mapk0y/runc,markllama/runc,lizf-os/runc,han-wang/runc,axsh/runc,estesp/libcontainer,dqminh/runc,marcosnils/runc,YujiOshima/runc,albertoleal/runc,BrickXu/libcontainer,thaJeztah/libcontainer,hxfeng/runc,wcwxyz/runc,docker/runc,LK4D4/runc,navidshaikh/runc,Mashimiao/libcontainer,booyaa/runc,ddnbgroup/runc,whosthatknocking/runc,WeiZhang555/runc,estesp/runc,ZJU-SEL/libcontainer,Microsoft/libcontainer,shishir-a412ed/runc,rsampaio/runc,cxxly/runc,han-wang/runc,liuwharton/runc,cloudfoundry-incubator/runc,HardikDR/runc,hxfeng/runc,cxxly/runc,haijunTan/runc,sunyuan3/runc,rajasec/runc,wking/runc,dqminh/libcontainer,InformatiQ/runc,ekuric/runc,Microsoft/libcontainer,xiaochenshen/runc,albertoleal/runc,ZJU-SEL/runc,ChengTiesheng/runc,stefanberger/runc,adrianreber/runc,boucher/runc,wangkirin/runc,crosbymichael/libcontainer,laijs/runc,aidanhs/runc,nkwilson/runc,InformatiQ/runc,mrunalp/libcontainer,carlye566/runc,keloyang/libcontainer,zenlinTechnofreak/runc,crosbymichael/libcontainer,shenxiaochen/libcontainer,estesp/libcontainer,maxamillion/runc,aidanhs/runc,dqminh/runc,Mashimiao/libcontainer,maxamillion/runc,laijs/runc,docker/libcontainer,calavera/runc,ycaihua/libcontainer,dqminh/libcontainer,intfrr/runc,boucher/libcontainer,ZJU-SEL/runc,boucher/libcontainer,nkwilson/runc,talwai/runc,haijunTan/runc,rsampaio/runc,balajibr/runc,stefanberger/runc,zenlinTechnofreak/runc,shishir-a412ed/runc,w4ngyi/libcontainer,kimh/runc,intfrr/runc,coolljt0725/runc,coolljt0725/runc,liuwharton/runc,cyphar/runc,gitido/runc,rootfs/runc,meihuabo/runc,jhowardmsft/runc,balajibr/runc,LK4D4/runc,balajibr/runc,ycaihua/libcontainer,sunyuan3/runc,mrunalp/runc,whuwxl/libcontainer,mrunalp/libcontainer,docker/libcontainer,whuwxl/libcontainer,rsampaio/runc,sunyuan3/runc,crosbymichael/runc,keloyang/runc,axsh/runc,dieface/runc,opencontainers/runc,mikebrow/runc,talwai/runc,inatatsu/runc,kimh/runc,chenchun/runc,xiaochenshen/runc,BrickXu/libcontainer,estesp/runc,booyaa/runc,wangkirin/runc,mheon/libcontainer,wking/runc,calavera/runc,mikebrow/runc,HuKeping/runc,runcom/runc,inatatsu/runc,Mashimiao/libcontainer,dqminh/runc,intfrr/runc,boucher/runc,runcom/runc,SaiedKazemi/libcontainer-criu,gitido/runc,jwuwork/runc,adrianreber/runc,runcom/libcontainer,opencontainers/runc,laijs/runc,ddnbgroup/runc,jhjeong-kr/runc,avagin/runc,docker/libcontainer,hqhq/runc,BrickXu/libcontainer,YujiOshima/runc,LTD-Beget/libcontainer,coolljt0725/runc,ekuric/runc,boucher/runc,navidshaikh/runc,HardikDR/runc,whuwxl/libcontainer