test: fix TestDupNamespaces
test: fix TestDupNamespaces

add Root in created spec, or error message is 'Root must be specified'

Signed-off-by: Ace-Tang <a967bc6ab01ace27203ca6ab9fd77fbd3b598184@126.com>

crosbymichael/runc,mheon/runc,laijs/runc,mheon/runc,estesp/runc,mYmNeo/runc,kolyshkin/runc,dqminh/runc,xiaochenshen/runc,estesp/runc,opencontainers/runc,mheon/runc,opencontainers/runc,estesp/runc,rhatdan/runc,crosbymichael/runc,dqminh/runc,laijs/runc,dqminh/runc,xiaochenshen/runc,rhatdan/runc,mikebrow/runc,rhatdan/runc,crosbymichael/runc,opencontainers/runc,kolyshkin/runc,justincormack/runc,adrianreber/runc,mikebrow/runc,dqminh/runc,rhatdan/runc,laijs/runc,opencontainers/runc,mikebrow/runc,mYmNeo/runc,xiaochenshen/runc,adrianreber/runc,justincormack/runc,mYmNeo/runc,adrianreber/runc,kolyshkin/runc,kolyshkin/runc,justincormack/runc