Fix system test of 'containers -a'
Fix system test of 'containers -a'

Signed-off-by: Hironori Shiina <cd98fe429f63e39e163df5347756b87c65f75ea9@jp.fujitsu.com>

rhatdan/buildah,nalind/buildah,projectatomic/buildah,projectatomic/buildah,nalind/buildah-1,nalind/buildah,TomSweeneyRedHat/buildah,TomSweeneyRedHat/buildah,nalind/buildah-1,nalind/buildah-1,projectatomic/buildah,rhatdan/buildah,TomSweeneyRedHat/buildah,rhatdan/buildah