libcontainer: cgroups: add tests for pids.max in PidsStats
libcontainer: cgroups: add tests for pids.max in PidsStats

Signed-off-by: Aleksa Sarai <a8eb12d32d6ec07cdf737175ec7d4a0f1b4e1ee7@suse.de>

WeiZhang555/runc,jhowardmsft/runc,dqminh/runc,coolljt0725/runc,docker/runc,jhowardmsft/runc,rhatdan/runc,abduld/runc,mikebrow/runc,cyphar/runc,wking/runc,WeiZhang555/runc,cloudfoundry-incubator/runc,crosbymichael/runc,avagin/runc,coolljt0725/runc,vbatts/runc,mYmNeo/runc,adrianreber/runc,keloyang/runc,inatatsu/runc,mikebrow/runc,ZJU-SEL/runc,hqhq/runc,maxamillion/runc,xiaochenshen/runc,mYmNeo/runc,ZJU-SEL/runc,cyphar/runc,stefanberger/runc,shishir-a412ed/runc,vbatts/runc,estesp/runc,wking/runc,estesp/runc,mheon/runc,dqminh/runc,keloyang/runc,kolyshkin/runc,avagin/runc,sunyuan3/runc,inatatsu/runc,jhowardmsft/runc,hqhq/runc,stefanberger/runc,mYmNeo/runc,adrianreber/runc,mheon/runc,rajasec/runc,keloyang/runc,maxamillion/runc,rhatdan/runc,opencontainers/runc,rajasec/runc,estesp/runc,ZJU-SEL/runc,justincormack/runc,nkwilson/runc,laijs/runc,albertoleal/runc,mheon/runc,dqminh/runc,albertoleal/runc,wking/runc,xiaochenshen/runc,abduld/runc,cyphar/runc,abduld/runc,crosbymichael/runc,adrianreber/runc,dqminh/runc,maxamillion/runc,laijs/runc,justincormack/runc,WeiZhang555/runc,stefanberger/runc,crosbymichael/runc,opencontainers/runc,albertoleal/runc,opencontainers/runc,shishir-a412ed/runc,nkwilson/runc,nkwilson/runc,vbatts/runc,hqhq/runc,rajasec/runc,justincormack/runc,xiaochenshen/runc,kolyshkin/runc,coolljt0725/runc,sunyuan3/runc,sunyuan3/runc,avagin/runc,kolyshkin/runc,shishir-a412ed/runc,kolyshkin/runc,cloudfoundry-incubator/runc,opencontainers/runc,rhatdan/runc,docker/runc,laijs/runc,mikebrow/runc,cloudfoundry-incubator/runc,inatatsu/runc,docker/runc,rhatdan/runc