nsenter: add tests
nsenter: add tests

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

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