Fix nsinit to configure default cgroup entry for MemorySwappiness
Fix nsinit to configure default cgroup entry for MemorySwappiness

As related to #639, this at least makes the "nsinit" consumer of
libcontainer initialize the value to "-1" and also allows the user to
specify a setting for the container.

This is an analog to Docker PR docker/docker#14030.

Docker-DCO-1.1-Signed-off-by: Phil Estes <estesp@linux.vnet.ibm.com> (github: estesp)

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