factory: use e{u,g}id as the owner of /run/runc/$id
factory: use e{u,g}id as the owner of /run/runc/$id

It appears as though these semantics were not fully thought out when
implementing them for rootless containers. It is not necessary (and
could be potentially dangerous) to set the owner of /run/ctr/$id to be
the root inside the container (if user namespaces are being used).

Instead, just use the e{g,u}id of runc to determine the owner.

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

adrianreber/runc,cyphar/runc,kolyshkin/runc,wking/runc,rhatdan/runc,wking/runc,sunyuan3/runc,xiaochenshen/runc,opencontainers/runc,mheon/runc,mikebrow/runc,cloudfoundry-incubator/runc,docker/runc,kolyshkin/runc,adrianreber/runc,crosbymichael/runc,mYmNeo/runc,rajasec/runc,laijs/runc,stefanberger/runc,mikebrow/runc,kolyshkin/runc,stefanberger/runc,justincormack/runc,estesp/runc,hqhq/runc,sunyuan3/runc,justincormack/runc,kolyshkin/runc,hqhq/runc,estesp/runc,xiaochenshen/runc,estesp/runc,rhatdan/runc,opencontainers/runc,crosbymichael/runc,dqminh/runc,rajasec/runc,mYmNeo/runc,mheon/runc,dqminh/runc,adrianreber/runc,mYmNeo/runc,sunyuan3/runc,wking/runc,hqhq/runc,rhatdan/runc,rhatdan/runc,mheon/runc,stefanberger/runc,opencontainers/runc,rajasec/runc,cloudfoundry-incubator/runc,cyphar/runc,mikebrow/runc,docker/runc,cyphar/runc,opencontainers/runc,dqminh/runc,crosbymichael/runc,xiaochenshen/runc,laijs/runc,docker/runc,justincormack/runc,cloudfoundry-incubator/runc,laijs/runc,dqminh/runc